diff --git a/.cron.yml b/.cron.yml
deleted file mode 100644
index 152b128..0000000
--- a/.cron.yml
+++ /dev/null
@@ -1,7 +0,0 @@
-# Definitions for jobs that run periodically.  For details on the format, see
-# `taskcluster/taskgraph/cron/schema.py`.  For documentation, see
-# `taskcluster/docs/cron.rst`.
-
----
-
-jobs: []
diff --git a/taskcluster/ci/build/kind.yml b/taskcluster/ci/build/kind.yml
deleted file mode 100644
index 687216e..0000000
--- a/taskcluster/ci/build/kind.yml
+++ /dev/null
@@ -1,39 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
----
-loader: taskgraph.loader.transform:loader
-
-transforms:
-    - xpi_taskgraph.build:transforms
-    - xpi_taskgraph.cached:transforms
-    - taskgraph.transforms.cached_tasks:transforms
-    - taskgraph.transforms.job:transforms
-    - taskgraph.transforms.task:transforms
-
-task-defaults:
-    description: Build XPI from source code.
-    worker-type: b-linux
-    worker:
-        max-run-time: 7200
-        docker-image:
-            indexed: xpi.cache.level-3.docker-images.v2.node-16.latest
-        chain-of-trust: true
-        volumes:
-            - /builds/worker/checkouts
-            - /builds/worker/.cache
-    run:
-        checkout:
-            xpi: {}
-        use-caches: false
-
-tasks:
-    ci:
-        attributes:
-            code-review: true
-        run:
-            using: run-task
-            cwd: '{checkout}'
-            cache-dotcache: false
-            command: >-
-                python3 /usr/local/bin/build.py
diff --git a/taskcluster/ci/config.yml b/taskcluster/ci/config.yml
deleted file mode 100644
index c04490a..0000000
--- a/taskcluster/ci/config.yml
+++ /dev/null
@@ -1,34 +0,0 @@
----
-trust-domain: xpi
-
-task-priority: lowest
-
-taskgraph:
-    register: xpi_taskgraph:register
-    decision-parameters: 'xpi_taskgraph.parameters:get_decision_parameters'
-    repositories:
-        xpi:
-            name: "XPI source"
-            project-regex: '(?!xpi-template)'
-        template:
-            name: "XPI template"
-            project-regex: 'xpi-template'
-            default-repository: https://github.com/mozilla-extensions/xpi-template
-            default-ref: master
-            type: git
-
-workers:
-    aliases:
-        b-linux:
-            provisioner: xpi-{level}
-            implementation: docker-worker
-            os: linux
-            worker-type: 'b-linux-gcp'
-        dep-signing:
-            provisioner: scriptworker-k8s
-            implementation: scriptworker-signing
-            os: scriptworker
-            worker-type: xpi-t-signing
-
-scriptworker:
-    scope-prefix: project:xpi:releng
diff --git a/taskcluster/ci/dep-signing/kind.yml b/taskcluster/ci/dep-signing/kind.yml
deleted file mode 100644
index 670fabd..0000000
--- a/taskcluster/ci/dep-signing/kind.yml
+++ /dev/null
@@ -1,21 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
----
-
-loader: xpi_taskgraph.single_dep:loader
-
-kind-dependencies:
-    - build
-
-transforms:
-    - xpi_taskgraph.signing:transforms
-    - taskgraph.transforms.task:transforms
-
-task-template:
-    description: Development-sign XPI
-    worker-type: dep-signing
-    worker:
-        signing-type: dep-signing
-        max-run-time: 3600
-    run-on-tasks-for: ['github-pull-request', 'github-push']
diff --git a/taskcluster/ci/linter/kind.yml b/taskcluster/ci/linter/kind.yml
deleted file mode 100644
index caee001..0000000
--- a/taskcluster/ci/linter/kind.yml
+++ /dev/null
@@ -1,39 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
----
-
-loader: xpi_taskgraph.single_dep:loader
-
-kind-dependencies:
-    - build
-
-transforms:
-    - xpi_taskgraph.linter:transforms
-    - taskgraph.transforms.job:transforms
-    - taskgraph.transforms.task:transforms
-
-task-template:
-    description: Run addons-linter
-    worker-type: b-linux
-    worker:
-        max-run-time: 7200
-        docker-image:
-            indexed: xpi.cache.level-3.docker-images.v2.node-16.latest
-        volumes:
-            - /builds/worker/checkouts
-    run:
-        using: run-task
-        cache-dotcache: false
-        checkout:
-            xpi: {}
-        use-caches: false
-        cwd: '{checkout}'
-        # TODO: We should enable MV3 when we are ready to accept MV3 add-ons.
-        # This should be done by replacing `2` with `3` in the command below.
-        command: >-
-            curl -sSL --fail --retry 3 -o {xpi_file} "$XPI_URL" &&
-            npx -y addons-linter --privileged --boring --disable-xpi-autoclose --max-manifest-version=2 {xpi_file}
-
-    attributes:
-        code-review: true
diff --git a/taskcluster/ci/pr/kind.yml b/taskcluster/ci/pr/kind.yml
deleted file mode 100644
index f8cefe4..0000000
--- a/taskcluster/ci/pr/kind.yml
+++ /dev/null
@@ -1,20 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
----
-loader: taskgraph.loader.transform:loader
-
-kind-dependencies:
-    - build
-    - test
-    - linter
-
-transforms:
-    - taskgraph.transforms.code_review:transforms
-    - taskgraph.transforms.task:transforms
-
-tasks:
-    complete:
-        description: PR Summary Task
-        run-on-tasks-for: [github-pull-request]
-        worker-type: succeed
diff --git a/taskcluster/ci/test/kind.yml b/taskcluster/ci/test/kind.yml
deleted file mode 100644
index f5de938..0000000
--- a/taskcluster/ci/test/kind.yml
+++ /dev/null
@@ -1,38 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
----
-loader: taskgraph.loader.transform:loader
-
-transforms:
-    - xpi_taskgraph.test:transforms
-    - xpi_taskgraph.cached:transforms
-    - taskgraph.transforms.cached_tasks:transforms
-    - taskgraph.transforms.job:transforms
-    - taskgraph.transforms.task:transforms
-
-task-defaults:
-    description: Test XPI
-    worker-type: b-linux
-    worker:
-        max-run-time: 7200
-        docker-image:
-            indexed: xpi.cache.level-3.docker-images.v2.node-16.latest
-        volumes:
-            - /builds/worker/checkouts
-            - /builds/worker/.cache
-    run:
-        checkout:
-            xpi: {}
-        use-caches: false
-
-tasks:
-    ci:
-        attributes:
-            code-review: true
-        run:
-            using: run-task
-            cwd: '{checkout}'
-            cache-dotcache: false
-            command: >-
-                python3 /usr/local/bin/test.py {target}
diff --git a/taskcluster/requirements.in b/taskcluster/requirements.in
deleted file mode 100644
index 5383337..0000000
--- a/taskcluster/requirements.in
+++ /dev/null
@@ -1,4 +0,0 @@
-# For instructions on managing dependencies, see:
-# https://taskcluster-taskgraph.readthedocs.io/en/latest/howto/bootstrap-taskgraph.html
-
-taskcluster-taskgraph>=1.3.1
diff --git a/taskcluster/requirements.txt b/taskcluster/requirements.txt
deleted file mode 100644
index e116924..0000000
--- a/taskcluster/requirements.txt
+++ /dev/null
@@ -1,289 +0,0 @@
-#
-# This file is autogenerated by pip-compile with Python 3.9
-# by the following command:
-#
-#    pip-compile --generate-hashes taskcluster/requirements.in
-#
-appdirs==1.4.4 \
-    --hash=sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41 \
-    --hash=sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128
-    # via taskcluster-taskgraph
-arrow==1.2.3 \
-    --hash=sha256:3934b30ca1b9f292376d9db15b19446088d12ec58629bc3f0da28fd55fb633a1 \
-    --hash=sha256:5a49ab92e3b7b71d96cd6bfcc4df14efefc9dfa96ea19045815914a6ab6b1fe2
-    # via jinja2-time
-attrs==22.2.0 \
-    --hash=sha256:29e95c7f6778868dbd49170f98f8818f78f3dc5e0e37c0b1f474e3561b240836 \
-    --hash=sha256:c9227bfc2f01993c03f68db37d1d15c9690188323c067c641f1a35ca58185f99
-    # via taskcluster-taskgraph
-binaryornot==0.4.4 \
-    --hash=sha256:359501dfc9d40632edc9fac890e19542db1a287bbcfa58175b66658392018061 \
-    --hash=sha256:b8b71173c917bddcd2c16070412e369c3ed7f0528926f70cac18a6c97fd563e4
-    # via cookiecutter
-certifi==2022.12.7 \
-    --hash=sha256:35824b4c3a97115964b408844d64aa14db1cc518f6562e8d7261699d1350a9e3 \
-    --hash=sha256:4ad3232f5e926d6718ec31cfc1fcadfde020920e278684144551c91769c7bc18
-    # via requests
-chardet==5.1.0 \
-    --hash=sha256:0d62712b956bc154f85fb0a266e2a3c5913c2967e00348701b32411d6def31e5 \
-    --hash=sha256:362777fb014af596ad31334fde1e8c327dfdb076e1960d1694662d46a6917ab9
-    # via binaryornot
-charset-normalizer==3.1.0 \
-    --hash=sha256:04afa6387e2b282cf78ff3dbce20f0cc071c12dc8f685bd40960cc68644cfea6 \
-    --hash=sha256:04eefcee095f58eaabe6dc3cc2262f3bcd776d2c67005880894f447b3f2cb9c1 \
-    --hash=sha256:0be65ccf618c1e7ac9b849c315cc2e8a8751d9cfdaa43027d4f6624bd587ab7e \
-    --hash=sha256:0c95f12b74681e9ae127728f7e5409cbbef9cd914d5896ef238cc779b8152373 \
-    --hash=sha256:0ca564606d2caafb0abe6d1b5311c2649e8071eb241b2d64e75a0d0065107e62 \
-    --hash=sha256:10c93628d7497c81686e8e5e557aafa78f230cd9e77dd0c40032ef90c18f2230 \
-    --hash=sha256:11d117e6c63e8f495412d37e7dc2e2fff09c34b2d09dbe2bee3c6229577818be \
-    --hash=sha256:11d3bcb7be35e7b1bba2c23beedac81ee893ac9871d0ba79effc7fc01167db6c \
-    --hash=sha256:12a2b561af122e3d94cdb97fe6fb2bb2b82cef0cdca131646fdb940a1eda04f0 \
-    --hash=sha256:12d1a39aa6b8c6f6248bb54550efcc1c38ce0d8096a146638fd4738e42284448 \
-    --hash=sha256:1435ae15108b1cb6fffbcea2af3d468683b7afed0169ad718451f8db5d1aff6f \
-    --hash=sha256:1c60b9c202d00052183c9be85e5eaf18a4ada0a47d188a83c8f5c5b23252f649 \
-    --hash=sha256:1e8fcdd8f672a1c4fc8d0bd3a2b576b152d2a349782d1eb0f6b8e52e9954731d \
-    --hash=sha256:20064ead0717cf9a73a6d1e779b23d149b53daf971169289ed2ed43a71e8d3b0 \
-    --hash=sha256:21fa558996782fc226b529fdd2ed7866c2c6ec91cee82735c98a197fae39f706 \
-    --hash=sha256:22908891a380d50738e1f978667536f6c6b526a2064156203d418f4856d6e86a \
-    --hash=sha256:3160a0fd9754aab7d47f95a6b63ab355388d890163eb03b2d2b87ab0a30cfa59 \
-    --hash=sha256:322102cdf1ab682ecc7d9b1c5eed4ec59657a65e1c146a0da342b78f4112db23 \
-    --hash=sha256:34e0a2f9c370eb95597aae63bf85eb5e96826d81e3dcf88b8886012906f509b5 \
-    --hash=sha256:3573d376454d956553c356df45bb824262c397c6e26ce43e8203c4c540ee0acb \
-    --hash=sha256:3747443b6a904001473370d7810aa19c3a180ccd52a7157aacc264a5ac79265e \
-    --hash=sha256:38e812a197bf8e71a59fe55b757a84c1f946d0ac114acafaafaf21667a7e169e \
-    --hash=sha256:3a06f32c9634a8705f4ca9946d667609f52cf130d5548881401f1eb2c39b1e2c \
-    --hash=sha256:3a5fc78f9e3f501a1614a98f7c54d3969f3ad9bba8ba3d9b438c3bc5d047dd28 \
-    --hash=sha256:3d9098b479e78c85080c98e1e35ff40b4a31d8953102bb0fd7d1b6f8a2111a3d \
-    --hash=sha256:3dc5b6a8ecfdc5748a7e429782598e4f17ef378e3e272eeb1340ea57c9109f41 \
-    --hash=sha256:4155b51ae05ed47199dc5b2a4e62abccb274cee6b01da5b895099b61b1982974 \
-    --hash=sha256:49919f8400b5e49e961f320c735388ee686a62327e773fa5b3ce6721f7e785ce \
-    --hash=sha256:53d0a3fa5f8af98a1e261de6a3943ca631c526635eb5817a87a59d9a57ebf48f \
-    --hash=sha256:5f008525e02908b20e04707a4f704cd286d94718f48bb33edddc7d7b584dddc1 \
-    --hash=sha256:628c985afb2c7d27a4800bfb609e03985aaecb42f955049957814e0491d4006d \
-    --hash=sha256:65ed923f84a6844de5fd29726b888e58c62820e0769b76565480e1fdc3d062f8 \
-    --hash=sha256:6734e606355834f13445b6adc38b53c0fd45f1a56a9ba06c2058f86893ae8017 \
-    --hash=sha256:6baf0baf0d5d265fa7944feb9f7451cc316bfe30e8df1a61b1bb08577c554f31 \
-    --hash=sha256:6f4f4668e1831850ebcc2fd0b1cd11721947b6dc7c00bf1c6bd3c929ae14f2c7 \
-    --hash=sha256:6f5c2e7bc8a4bf7c426599765b1bd33217ec84023033672c1e9a8b35eaeaaaf8 \
-    --hash=sha256:6f6c7a8a57e9405cad7485f4c9d3172ae486cfef1344b5ddd8e5239582d7355e \
-    --hash=sha256:7381c66e0561c5757ffe616af869b916c8b4e42b367ab29fedc98481d1e74e14 \
-    --hash=sha256:73dc03a6a7e30b7edc5b01b601e53e7fc924b04e1835e8e407c12c037e81adbd \
-    --hash=sha256:74db0052d985cf37fa111828d0dd230776ac99c740e1a758ad99094be4f1803d \
-    --hash=sha256:75f2568b4189dda1c567339b48cba4ac7384accb9c2a7ed655cd86b04055c795 \
-    --hash=sha256:78cacd03e79d009d95635e7d6ff12c21eb89b894c354bd2b2ed0b4763373693b \
-    --hash=sha256:80d1543d58bd3d6c271b66abf454d437a438dff01c3e62fdbcd68f2a11310d4b \
-    --hash=sha256:830d2948a5ec37c386d3170c483063798d7879037492540f10a475e3fd6f244b \
-    --hash=sha256:891cf9b48776b5c61c700b55a598621fdb7b1e301a550365571e9624f270c203 \
-    --hash=sha256:8f25e17ab3039b05f762b0a55ae0b3632b2e073d9c8fc88e89aca31a6198e88f \
-    --hash=sha256:9a3267620866c9d17b959a84dd0bd2d45719b817245e49371ead79ed4f710d19 \
-    --hash=sha256:a04f86f41a8916fe45ac5024ec477f41f886b3c435da2d4e3d2709b22ab02af1 \
-    --hash=sha256:aaf53a6cebad0eae578f062c7d462155eada9c172bd8c4d250b8c1d8eb7f916a \
-    --hash=sha256:abc1185d79f47c0a7aaf7e2412a0eb2c03b724581139193d2d82b3ad8cbb00ac \
-    --hash=sha256:ac0aa6cd53ab9a31d397f8303f92c42f534693528fafbdb997c82bae6e477ad9 \
-    --hash=sha256:ac3775e3311661d4adace3697a52ac0bab17edd166087d493b52d4f4f553f9f0 \
-    --hash=sha256:b06f0d3bf045158d2fb8837c5785fe9ff9b8c93358be64461a1089f5da983137 \
-    --hash=sha256:b116502087ce8a6b7a5f1814568ccbd0e9f6cfd99948aa59b0e241dc57cf739f \
-    --hash=sha256:b82fab78e0b1329e183a65260581de4375f619167478dddab510c6c6fb04d9b6 \
-    --hash=sha256:bd7163182133c0c7701b25e604cf1611c0d87712e56e88e7ee5d72deab3e76b5 \
-    --hash=sha256:c36bcbc0d5174a80d6cccf43a0ecaca44e81d25be4b7f90f0ed7bcfbb5a00909 \
-    --hash=sha256:c3af8e0f07399d3176b179f2e2634c3ce9c1301379a6b8c9c9aeecd481da494f \
-    --hash=sha256:c84132a54c750fda57729d1e2599bb598f5fa0344085dbde5003ba429a4798c0 \
-    --hash=sha256:cb7b2ab0188829593b9de646545175547a70d9a6e2b63bf2cd87a0a391599324 \
-    --hash=sha256:cca4def576f47a09a943666b8f829606bcb17e2bc2d5911a46c8f8da45f56755 \
-    --hash=sha256:cf6511efa4801b9b38dc5546d7547d5b5c6ef4b081c60b23e4d941d0eba9cbeb \
-    --hash=sha256:d16fd5252f883eb074ca55cb622bc0bee49b979ae4e8639fff6ca3ff44f9f854 \
-    --hash=sha256:d2686f91611f9e17f4548dbf050e75b079bbc2a82be565832bc8ea9047b61c8c \
-    --hash=sha256:d7fc3fca01da18fbabe4625d64bb612b533533ed10045a2ac3dd194bfa656b60 \
-    --hash=sha256:dd5653e67b149503c68c4018bf07e42eeed6b4e956b24c00ccdf93ac79cdff84 \
-    --hash=sha256:de5695a6f1d8340b12a5d6d4484290ee74d61e467c39ff03b39e30df62cf83a0 \
-    --hash=sha256:e0ac8959c929593fee38da1c2b64ee9778733cdf03c482c9ff1d508b6b593b2b \
-    --hash=sha256:e1b25e3ad6c909f398df8921780d6a3d120d8c09466720226fc621605b6f92b1 \
-    --hash=sha256:e633940f28c1e913615fd624fcdd72fdba807bf53ea6925d6a588e84e1151531 \
-    --hash=sha256:e89df2958e5159b811af9ff0f92614dabf4ff617c03a4c1c6ff53bf1c399e0e1 \
-    --hash=sha256:ea9f9c6034ea2d93d9147818f17c2a0860d41b71c38b9ce4d55f21b6f9165a11 \
-    --hash=sha256:f645caaf0008bacf349875a974220f1f1da349c5dbe7c4ec93048cdc785a3326 \
-    --hash=sha256:f8303414c7b03f794347ad062c0516cee0e15f7a612abd0ce1e25caf6ceb47df \
-    --hash=sha256:fca62a8301b605b954ad2e9c3666f9d97f63872aa4efcae5492baca2056b74ab
-    # via requests
-click==8.1.3 \
-    --hash=sha256:7682dc8afb30297001674575ea00d1814d808d6a36af415a82bd481d37ba7b8e \
-    --hash=sha256:bb4d8133cb15a609f44e8213d9b391b0809795062913b383c62be0ee95b1db48
-    # via cookiecutter
-cookiecutter==2.1.1 \
-    --hash=sha256:9f3ab027cec4f70916e28f03470bdb41e637a3ad354b4d65c765d93aad160022 \
-    --hash=sha256:f3982be8d9c53dac1261864013fdec7f83afd2e42ede6f6dd069c5e149c540d5
-    # via taskcluster-taskgraph
-giturlparse==0.10.0 \
-    --hash=sha256:04ba1a3a099c3093fa8d24a422913c6a9b2c2cd22bcffc939cf72e3e98f672d7 \
-    --hash=sha256:2595ab291d30717cda8474b874c9fd509f1b9802ad7f6968c36a45e4b13eb337
-    # via mozilla-repo-urls
-idna==3.4 \
-    --hash=sha256:814f528e8dead7d329833b91c5faa87d60bf71824cd12a7530b5526063d02cb4 \
-    --hash=sha256:90b77e79eaa3eba6de819a0c442c0b4ceefc341a7a2ab77d7562bf49f425c5c2
-    # via requests
-jinja2==3.1.2 \
-    --hash=sha256:31351a702a408a9e7595a8fc6150fc3f43bb6bf7e319770cbc0db9df9437e852 \
-    --hash=sha256:6088930bfe239f0e6710546ab9c19c9ef35e29792895fed6e6e31a023a182a61
-    # via
-    #   cookiecutter
-    #   jinja2-time
-jinja2-time==0.2.0 \
-    --hash=sha256:d14eaa4d315e7688daa4969f616f226614350c48730bfa1692d2caebd8c90d40 \
-    --hash=sha256:d3eab6605e3ec8b7a0863df09cc1d23714908fa61aa6986a845c20ba488b4efa
-    # via cookiecutter
-json-e==4.5.1 \
-    --hash=sha256:1c3955a0ae541e757ab8055f6b62d9358011150bbe7677728e3ba6b543352168 \
-    --hash=sha256:64f32ec098fff61ba5f4f71ff88caf89b59eaf2ffee67ffc64ecb04e22bb82fe
-    # via taskcluster-taskgraph
-markupsafe==2.1.2 \
-    --hash=sha256:0576fe974b40a400449768941d5d0858cc624e3249dfd1e0c33674e5c7ca7aed \
-    --hash=sha256:085fd3201e7b12809f9e6e9bc1e5c96a368c8523fad5afb02afe3c051ae4afcc \
-    --hash=sha256:090376d812fb6ac5f171e5938e82e7f2d7adc2b629101cec0db8b267815c85e2 \
-    --hash=sha256:0b462104ba25f1ac006fdab8b6a01ebbfbce9ed37fd37fd4acd70c67c973e460 \
-    --hash=sha256:137678c63c977754abe9086a3ec011e8fd985ab90631145dfb9294ad09c102a7 \
-    --hash=sha256:1bea30e9bf331f3fef67e0a3877b2288593c98a21ccb2cf29b74c581a4eb3af0 \
-    --hash=sha256:22152d00bf4a9c7c83960521fc558f55a1adbc0631fbb00a9471e097b19d72e1 \
-    --hash=sha256:22731d79ed2eb25059ae3df1dfc9cb1546691cc41f4e3130fe6bfbc3ecbbecfa \
-    --hash=sha256:2298c859cfc5463f1b64bd55cb3e602528db6fa0f3cfd568d3605c50678f8f03 \
-    --hash=sha256:28057e985dace2f478e042eaa15606c7efccb700797660629da387eb289b9323 \
-    --hash=sha256:2e7821bffe00aa6bd07a23913b7f4e01328c3d5cc0b40b36c0bd81d362faeb65 \
-    --hash=sha256:2ec4f2d48ae59bbb9d1f9d7efb9236ab81429a764dedca114f5fdabbc3788013 \
-    --hash=sha256:340bea174e9761308703ae988e982005aedf427de816d1afe98147668cc03036 \
-    --hash=sha256:40627dcf047dadb22cd25ea7ecfe9cbf3bbbad0482ee5920b582f3809c97654f \
-    --hash=sha256:40dfd3fefbef579ee058f139733ac336312663c6706d1163b82b3003fb1925c4 \
-    --hash=sha256:4cf06cdc1dda95223e9d2d3c58d3b178aa5dacb35ee7e3bbac10e4e1faacb419 \
-    --hash=sha256:50c42830a633fa0cf9e7d27664637532791bfc31c731a87b202d2d8ac40c3ea2 \
-    --hash=sha256:55f44b440d491028addb3b88f72207d71eeebfb7b5dbf0643f7c023ae1fba619 \
-    --hash=sha256:608e7073dfa9e38a85d38474c082d4281f4ce276ac0010224eaba11e929dd53a \
-    --hash=sha256:63ba06c9941e46fa389d389644e2d8225e0e3e5ebcc4ff1ea8506dce646f8c8a \
-    --hash=sha256:65608c35bfb8a76763f37036547f7adfd09270fbdbf96608be2bead319728fcd \
-    --hash=sha256:665a36ae6f8f20a4676b53224e33d456a6f5a72657d9c83c2aa00765072f31f7 \
-    --hash=sha256:6d6607f98fcf17e534162f0709aaad3ab7a96032723d8ac8750ffe17ae5a0666 \
-    --hash=sha256:7313ce6a199651c4ed9d7e4cfb4aa56fe923b1adf9af3b420ee14e6d9a73df65 \
-    --hash=sha256:7668b52e102d0ed87cb082380a7e2e1e78737ddecdde129acadb0eccc5423859 \
-    --hash=sha256:7df70907e00c970c60b9ef2938d894a9381f38e6b9db73c5be35e59d92e06625 \
-    --hash=sha256:7e007132af78ea9df29495dbf7b5824cb71648d7133cf7848a2a5dd00d36f9ff \
-    --hash=sha256:835fb5e38fd89328e9c81067fd642b3593c33e1e17e2fdbf77f5676abb14a156 \
-    --hash=sha256:8bca7e26c1dd751236cfb0c6c72d4ad61d986e9a41bbf76cb445f69488b2a2bd \
-    --hash=sha256:8db032bf0ce9022a8e41a22598eefc802314e81b879ae093f36ce9ddf39ab1ba \
-    --hash=sha256:99625a92da8229df6d44335e6fcc558a5037dd0a760e11d84be2260e6f37002f \
-    --hash=sha256:9cad97ab29dfc3f0249b483412c85c8ef4766d96cdf9dcf5a1e3caa3f3661cf1 \
-    --hash=sha256:a4abaec6ca3ad8660690236d11bfe28dfd707778e2442b45addd2f086d6ef094 \
-    --hash=sha256:a6e40afa7f45939ca356f348c8e23048e02cb109ced1eb8420961b2f40fb373a \
-    --hash=sha256:a6f2fcca746e8d5910e18782f976489939d54a91f9411c32051b4aab2bd7c513 \
-    --hash=sha256:a806db027852538d2ad7555b203300173dd1b77ba116de92da9afbc3a3be3eed \
-    --hash=sha256:abcabc8c2b26036d62d4c746381a6f7cf60aafcc653198ad678306986b09450d \
-    --hash=sha256:b8526c6d437855442cdd3d87eede9c425c4445ea011ca38d937db299382e6fa3 \
-    --hash=sha256:bb06feb762bade6bf3c8b844462274db0c76acc95c52abe8dbed28ae3d44a147 \
-    --hash=sha256:c0a33bc9f02c2b17c3ea382f91b4db0e6cde90b63b296422a939886a7a80de1c \
-    --hash=sha256:c4a549890a45f57f1ebf99c067a4ad0cb423a05544accaf2b065246827ed9603 \
-    --hash=sha256:ca244fa73f50a800cf8c3ebf7fd93149ec37f5cb9596aa8873ae2c1d23498601 \
-    --hash=sha256:cf877ab4ed6e302ec1d04952ca358b381a882fbd9d1b07cccbfd61783561f98a \
-    --hash=sha256:d9d971ec1e79906046aa3ca266de79eac42f1dbf3612a05dc9368125952bd1a1 \
-    --hash=sha256:da25303d91526aac3672ee6d49a2f3db2d9502a4a60b55519feb1a4c7714e07d \
-    --hash=sha256:e55e40ff0cc8cc5c07996915ad367fa47da6b3fc091fdadca7f5403239c5fec3 \
-    --hash=sha256:f03a532d7dee1bed20bc4884194a16160a2de9ffc6354b3878ec9682bb623c54 \
-    --hash=sha256:f1cd098434e83e656abf198f103a8207a8187c0fc110306691a2e94a78d0abb2 \
-    --hash=sha256:f2bfb563d0211ce16b63c7cb9395d2c682a23187f54c3d79bfec33e6705473c6 \
-    --hash=sha256:f8ffb705ffcf5ddd0e80b65ddf7bed7ee4f5a441ea7d3419e861a12eaf41af58
-    # via jinja2
-mozilla-repo-urls==0.1.1 \
-    --hash=sha256:30510d3519479aa70211145d0ac9cf6e2fadcb8d30fa3b196bb957bd773502ba \
-    --hash=sha256:7364da790751db2a060eb45adbf1d7db89a145ed279ba235f3425db9dd255915
-    # via taskcluster-taskgraph
-python-dateutil==2.8.2 \
-    --hash=sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86 \
-    --hash=sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9
-    # via arrow
-python-slugify==8.0.1 \
-    --hash=sha256:70ca6ea68fe63ecc8fa4fcf00ae651fc8a5d02d93dcd12ae6d4fc7ca46c4d395 \
-    --hash=sha256:ce0d46ddb668b3be82f4ed5e503dbc33dd815d83e2eb6824211310d3fb172a27
-    # via cookiecutter
-pyyaml==6.0 \
-    --hash=sha256:01b45c0191e6d66c470b6cf1b9531a771a83c1c4208272ead47a3ae4f2f603bf \
-    --hash=sha256:0283c35a6a9fbf047493e3a0ce8d79ef5030852c51e9d911a27badfde0605293 \
-    --hash=sha256:055d937d65826939cb044fc8c9b08889e8c743fdc6a32b33e2390f66013e449b \
-    --hash=sha256:07751360502caac1c067a8132d150cf3d61339af5691fe9e87803040dbc5db57 \
-    --hash=sha256:0b4624f379dab24d3725ffde76559cff63d9ec94e1736b556dacdfebe5ab6d4b \
-    --hash=sha256:0ce82d761c532fe4ec3f87fc45688bdd3a4c1dc5e0b4a19814b9009a29baefd4 \
-    --hash=sha256:1e4747bc279b4f613a09eb64bba2ba602d8a6664c6ce6396a4d0cd413a50ce07 \
-    --hash=sha256:213c60cd50106436cc818accf5baa1aba61c0189ff610f64f4a3e8c6726218ba \
-    --hash=sha256:231710d57adfd809ef5d34183b8ed1eeae3f76459c18fb4a0b373ad56bedcdd9 \
-    --hash=sha256:277a0ef2981ca40581a47093e9e2d13b3f1fbbeffae064c1d21bfceba2030287 \
-    --hash=sha256:2cd5df3de48857ed0544b34e2d40e9fac445930039f3cfe4bcc592a1f836d513 \
-    --hash=sha256:40527857252b61eacd1d9af500c3337ba8deb8fc298940291486c465c8b46ec0 \
-    --hash=sha256:432557aa2c09802be39460360ddffd48156e30721f5e8d917f01d31694216782 \
-    --hash=sha256:473f9edb243cb1935ab5a084eb238d842fb8f404ed2193a915d1784b5a6b5fc0 \
-    --hash=sha256:48c346915c114f5fdb3ead70312bd042a953a8ce5c7106d5bfb1a5254e47da92 \
-    --hash=sha256:50602afada6d6cbfad699b0c7bb50d5ccffa7e46a3d738092afddc1f9758427f \
-    --hash=sha256:68fb519c14306fec9720a2a5b45bc9f0c8d1b9c72adf45c37baedfcd949c35a2 \
-    --hash=sha256:77f396e6ef4c73fdc33a9157446466f1cff553d979bd00ecb64385760c6babdc \
-    --hash=sha256:81957921f441d50af23654aa6c5e5eaf9b06aba7f0a19c18a538dc7ef291c5a1 \
-    --hash=sha256:819b3830a1543db06c4d4b865e70ded25be52a2e0631ccd2f6a47a2822f2fd7c \
-    --hash=sha256:897b80890765f037df3403d22bab41627ca8811ae55e9a722fd0392850ec4d86 \
-    --hash=sha256:98c4d36e99714e55cfbaaee6dd5badbc9a1ec339ebfc3b1f52e293aee6bb71a4 \
-    --hash=sha256:9df7ed3b3d2e0ecfe09e14741b857df43adb5a3ddadc919a2d94fbdf78fea53c \
-    --hash=sha256:9fa600030013c4de8165339db93d182b9431076eb98eb40ee068700c9c813e34 \
-    --hash=sha256:a80a78046a72361de73f8f395f1f1e49f956c6be882eed58505a15f3e430962b \
-    --hash=sha256:afa17f5bc4d1b10afd4466fd3a44dc0e245382deca5b3c353d8b757f9e3ecb8d \
-    --hash=sha256:b3d267842bf12586ba6c734f89d1f5b871df0273157918b0ccefa29deb05c21c \
-    --hash=sha256:b5b9eccad747aabaaffbc6064800670f0c297e52c12754eb1d976c57e4f74dcb \
-    --hash=sha256:bfaef573a63ba8923503d27530362590ff4f576c626d86a9fed95822a8255fd7 \
-    --hash=sha256:c5687b8d43cf58545ade1fe3e055f70eac7a5a1a0bf42824308d868289a95737 \
-    --hash=sha256:cba8c411ef271aa037d7357a2bc8f9ee8b58b9965831d9e51baf703280dc73d3 \
-    --hash=sha256:d15a181d1ecd0d4270dc32edb46f7cb7733c7c508857278d3d378d14d606db2d \
-    --hash=sha256:d4b0ba9512519522b118090257be113b9468d804b19d63c71dbcf4a48fa32358 \
-    --hash=sha256:d4db7c7aef085872ef65a8fd7d6d09a14ae91f691dec3e87ee5ee0539d516f53 \
-    --hash=sha256:d4eccecf9adf6fbcc6861a38015c2a64f38b9d94838ac1810a9023a0609e1b78 \
-    --hash=sha256:d67d839ede4ed1b28a4e8909735fc992a923cdb84e618544973d7dfc71540803 \
-    --hash=sha256:daf496c58a8c52083df09b80c860005194014c3698698d1a57cbcfa182142a3a \
-    --hash=sha256:dbad0e9d368bb989f4515da330b88a057617d16b6a8245084f1b05400f24609f \
-    --hash=sha256:e61ceaab6f49fb8bdfaa0f92c4b57bcfbea54c09277b1b4f7ac376bfb7a7c174 \
-    --hash=sha256:f84fbc98b019fef2ee9a1cb3ce93e3187a6df0b2538a651bfb890254ba9f90b5
-    # via
-    #   cookiecutter
-    #   taskcluster-taskgraph
-redo==2.0.4 \
-    --hash=sha256:81066955041c853b0e6491eb65a0877dce45131c4cfa3d42d923fc2aa8f7a043 \
-    --hash=sha256:c76e4c23ab2f8840261736a851323cd98493710e7a9d36a1058535dca501f293
-    # via taskcluster-taskgraph
-requests==2.28.2 \
-    --hash=sha256:64299f4909223da747622c030b781c0d7811e359c37124b4bd368fb8c6518baa \
-    --hash=sha256:98b1b2782e3c6c4904938b84c0eb932721069dfdb9134313beff7c83c2df24bf
-    # via
-    #   cookiecutter
-    #   requests-unixsocket
-    #   taskcluster-taskgraph
-requests-unixsocket==0.3.0 \
-    --hash=sha256:28304283ea9357d45fff58ad5b11e47708cfbf5806817aa59b2a363228ee971e \
-    --hash=sha256:c685c680f0809e1b2955339b1e5afc3c0022b3066f4f7eb343f43a6065fc0e5d
-    # via taskcluster-taskgraph
-six==1.16.0 \
-    --hash=sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926 \
-    --hash=sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254
-    # via python-dateutil
-slugid==2.0.0 \
-    --hash=sha256:a950d98b72691178bdd4d6c52743c4a2aa039207cf7a97d71060a111ff9ba297 \
-    --hash=sha256:aec8b0e01c4ad32e38e12d609eab3ec912fd129aaf6b2ded0199b56a5f8fd67c
-    # via taskcluster-taskgraph
-taskcluster-taskgraph==5.0.0 \
-    --hash=sha256:0e78089a8694b675442a92628354295c386536e5711f271ac492cbb88a4107c0 \
-    --hash=sha256:30e6e7e80d5296c5a8f1b2e8ce72c672984a6225b2f8d5a41efb7085209fb0ff
-    # via -r taskcluster/requirements.in
-taskcluster-urls==13.0.1 \
-    --hash=sha256:5e25e7e6818e8877178b175ff43d2e6548afad72694aa125f404a7329ece0973 \
-    --hash=sha256:b25e122ecec249c4299ac7b20b08db76e3e2025bdaeb699a9d444556de5fd367 \
-    --hash=sha256:f66dcbd6572a6216ab65949f0fa0b91f2df647918028436c384e6af5cd12ae2b
-    # via taskcluster-taskgraph
-text-unidecode==1.3 \
-    --hash=sha256:1311f10e8b895935241623731c2ba64f4c455287888b18189350b67134a822e8 \
-    --hash=sha256:bad6603bb14d279193107714b288be206cac565dfa49aa5b105294dd5c4aab93
-    # via python-slugify
-urllib3==1.26.15 \
-    --hash=sha256:8a388717b9476f934a21484e8c8e61875ab60644d29b9b39e11e4b9dc1c6b305 \
-    --hash=sha256:aa751d169e23c7479ce47a0cb0da579e3ede798f994f5816a74e4f4500dcea42
-    # via requests
-voluptuous==0.13.1 \
-    --hash=sha256:4b838b185f5951f2d6e8752b68fcf18bd7a9c26ded8f143f92d6d28f3921a3e6 \
-    --hash=sha256:e8d31c20601d6773cb14d4c0f42aee29c6821bbd1018039aac7ac5605b489723
-    # via taskcluster-taskgraph
diff --git a/taskcluster/xpi_taskgraph/__init__.py b/taskcluster/xpi_taskgraph/__init__.py
deleted file mode 100644
index f1cd52d..0000000
--- a/taskcluster/xpi_taskgraph/__init__.py
+++ /dev/null
@@ -1,29 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-from importlib import import_module
-
-
-def register(graph_config):
-    """
-    Import all modules that are siblings of this one, triggering decorators in
-    the process.
-    """
-    _import_modules(
-        [
-            "build",
-            "cached",
-            "parameters",
-            "single_dep",
-            "test",
-            "worker_types",
-            "xpi_manifest",
-        ]
-    )
-
-
-def _import_modules(modules):
-    for module in modules:
-        import_module(f".{module}", package=__name__)
diff --git a/taskcluster/xpi_taskgraph/build.py b/taskcluster/xpi_taskgraph/build.py
deleted file mode 100644
index 3a90951..0000000
--- a/taskcluster/xpi_taskgraph/build.py
+++ /dev/null
@@ -1,53 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-"""
-Apply some defaults and minor modifications to the jobs defined in the build
-kind.
-"""
-
-from copy import deepcopy
-import os
-
-from taskgraph.transforms.base import TransformSequence
-from xpi_taskgraph.xpi_manifest import get_manifest
-
-
-transforms = TransformSequence()
-
-
-@transforms.add
-def tasks_from_manifest(config, jobs):
-    manifest = get_manifest()
-    for job in jobs:
-        for xpi_config in manifest:
-            task = deepcopy(job)
-            env = task.setdefault("worker", {}).setdefault("env", {})
-            run = task.setdefault("run", {})
-            if "directory" in xpi_config:
-                run["cwd"] = "{checkout}/%s" % xpi_config["directory"]
-                extra = task.setdefault("extra", {})
-                extra["directory"] = xpi_config["directory"]
-            task["label"] = "build-{}".format(xpi_config["name"])
-            env["XPI_NAME"] = xpi_config["name"]
-            task.setdefault("extra", {})["xpi-name"] = xpi_config["name"]
-            if os.environ.get("XPI_SSH_SECRET_NAME"):
-                artifact_prefix = "xpi/build"
-            else:
-                artifact_prefix = "public/build"
-            task.setdefault("attributes", {})
-            task["attributes"]["artifact_prefix"] = artifact_prefix
-            env["ARTIFACT_PREFIX"] = artifact_prefix
-            artifacts = task["worker"].setdefault("artifacts", [])
-            artifacts.append(
-                {
-                    "type": "directory",
-                    "name": artifact_prefix,
-                    "path": "/builds/worker/artifacts",
-                }
-            )
-            task["worker"]["docker-image"]["indexed"] = xpi_config["docker-image"]
-            if xpi_config.get("install-type"):
-                env["XPI_INSTALL_TYPE"] = xpi_config["install-type"]
-
-            yield task
diff --git a/taskcluster/xpi_taskgraph/cached.py b/taskcluster/xpi_taskgraph/cached.py
deleted file mode 100644
index 0e9f2c9..0000000
--- a/taskcluster/xpi_taskgraph/cached.py
+++ /dev/null
@@ -1,77 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-import hashlib
-import os
-import subprocess
-
-import taskgraph
-from taskgraph.transforms.base import TransformSequence
-from taskgraph.util.hash import hash_path
-
-transforms = TransformSequence()
-
-BASE_DIR = os.getcwd()
-
-# Directory names we ignore, anywhere in the tree
-# We won't recurse into these directories.
-IGNORE_DIRS = (".git", "node_modules")
-
-# File extensions we ignore, anywhere in the tree
-IGNORE_EXTENSIONS = (".pyc", ".swp")
-
-ADDITIONAL_FILES = (".taskcluster.yml", "eslintrc.js")
-
-
-def list_files(path):
-    files = []
-    for dir_name, subdir_list, file_list in os.walk(path):
-        for dir_ in subdir_list:
-            if dir_ in IGNORE_DIRS:
-                subdir_list.remove(dir_)
-                continue
-        for file_ in file_list:
-            (_, ext) = os.path.splitext(file_)
-            if ext in IGNORE_EXTENSIONS:
-                continue
-            files.append(
-                os.path.relpath(os.path.join(BASE_DIR, dir_name, file_), BASE_DIR)
-            )
-    return set(files)
-
-
-@transforms.add
-def build_cache(config, tasks):
-    repo_name = subprocess.check_output(
-        ["git", "remote", "get-url", "origin"], universal_newlines=True
-    )
-    repo_name = str(repo_name).rstrip()
-    repo_name = repo_name.replace(".git", "").rstrip("/")
-    repo_name = repo_name.split("/")[-1]
-
-    for task in tasks:
-        if task.get("cache", True) and not taskgraph.fast:
-            directory = task.get("extra", {}).get("directory", BASE_DIR)
-            directory = os.path.join(BASE_DIR, directory)
-            files = list_files(directory)
-            files.update(list_files(os.path.join(BASE_DIR, "taskcluster")))
-            for path in ADDITIONAL_FILES:
-                if os.path.exists(path):
-                    files.update({path})
-            h = hashlib.sha256()
-            for path in sorted(list(files)):
-                paths = "{} {}\n".format(
-                    hash_path(os.path.realpath(os.path.join(BASE_DIR, path))), path
-                )
-                h.update(paths.encode("UTF-8"))
-            task.setdefault("attributes", {}).setdefault("cached_task", {})
-            cache_name = task["label"].replace(":", "-")
-            task["cache"] = {
-                "type": f"{repo_name}.v2",
-                "name": cache_name,
-                "digest-data": [h.hexdigest()],
-            }
-
-        yield task
diff --git a/taskcluster/xpi_taskgraph/linter.py b/taskcluster/xpi_taskgraph/linter.py
deleted file mode 100644
index d67f195..0000000
--- a/taskcluster/xpi_taskgraph/linter.py
+++ /dev/null
@@ -1,48 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-"""
-Apply some defaults and minor modifications to the jobs defined in the build
-kind to run https://github.com/mozilla/addons-linter.
-"""
-
-
-import os
-
-from taskgraph.transforms.base import TransformSequence
-from taskgraph.util.schema import resolve_keyed_by
-from taskgraph.util.keyed_by import evaluate_keyed_by
-
-
-transforms = TransformSequence()
-
-
-@transforms.add
-def run_addons_linter(config, tasks):
-    for task in tasks:
-        # We only want to execute addons-linter on privileged extensions (for now).
-        if os.environ.get("XPI_SIGNING_TYPE") != "privileged":
-            continue
-
-        dep = task.pop("primary-dependency")
-
-        # Add a dependency to the build task because we want to lint the
-        # generated XPI.
-        task["dependencies"] = {"build": dep.label}
-
-        artifact_prefix = dep.task["payload"]["env"]["ARTIFACT_PREFIX"].rstrip("/")
-        xpi_name = dep.task["extra"]["xpi-name"]
-        xpi_file = f"{xpi_name}.xpi"
-
-        # Set task label.
-        task["label"] = f"linter-{xpi_name}"
-
-        # Replace variables in the `command` to execute. We use an `env`
-        # variable for the `XPI_URL` to leverage `artifact-reference`.
-        env = task.setdefault("worker", {}).setdefault("env", {})
-
-        env["XPI_URL"] = {"artifact-reference": f"<build/{artifact_prefix}/{xpi_file}>"}
-        run = task["run"]
-        run["command"] = run["command"].format(xpi_file=xpi_file)
-
-        yield task
diff --git a/taskcluster/xpi_taskgraph/parameters.py b/taskcluster/xpi_taskgraph/parameters.py
deleted file mode 100644
index fed53e9..0000000
--- a/taskcluster/xpi_taskgraph/parameters.py
+++ /dev/null
@@ -1,22 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-import os
-
-
-def get_decision_parameters(graph_config, parameters):
-    """Add repo-specific decision parameters.
-
-    We don't have any repo-specific decision parameters, but we do need to
-    set repositories' `ssh-secret-name` if they're private repos. This seemed
-    to be the least objectionable place to add that.
-
-    """
-    for repo_prefix, repo_config in graph_config._config["taskgraph"][
-        "repositories"
-    ].items():
-        env_var = f"{repo_prefix.upper()}_SSH_SECRET_NAME"
-        if os.environ.get(env_var):
-            repo_config.setdefault("ssh-secret-name", os.environ[env_var])
diff --git a/taskcluster/xpi_taskgraph/signing.py b/taskcluster/xpi_taskgraph/signing.py
deleted file mode 100644
index aeb82e6..0000000
--- a/taskcluster/xpi_taskgraph/signing.py
+++ /dev/null
@@ -1,83 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-"""
-Apply some defaults and minor modifications to the jobs defined in the build
-kind.
-"""
-
-
-import os
-
-from taskgraph.transforms.base import TransformSequence
-from taskgraph.util.schema import resolve_keyed_by
-from taskgraph.util.keyed_by import evaluate_keyed_by
-
-
-transforms = TransformSequence()
-
-FORMATS = {
-    "mozillaonline-privileged": "privileged_webextension",
-    # normandy-privileged is deprecated
-    "normandy-privileged": "privileged_webextension",
-    "privileged": "privileged_webextension",
-    "system": "system_addon",
-}
-
-
-@transforms.add
-def define_signing_flags(config, tasks):
-    for task in tasks:
-        dep = task["primary-dependency"]
-        # Current kind will be prepended later in the transform chain.
-        task["name"] = _get_dependent_job_name_without_its_kind(dep)
-        attributes = dep.attributes.copy()
-        if task.get("attributes"):
-            attributes.update(task["attributes"])
-        task["attributes"] = attributes
-        task["attributes"]["signed"] = True
-        if "run_on_tasks_for" in task["attributes"]:
-            task.setdefault("run-on-tasks-for", task["attributes"]["run_on_tasks_for"])
-
-        for key in ("worker-type", "worker.signing-type"):
-            resolve_keyed_by(
-                task,
-                key,
-                item_name=task["name"],
-                level=config.params["level"],
-            )
-        yield task
-
-
-@transforms.add
-def build_signing_task(config, tasks):
-    xpi_type = os.environ.get("XPI_SIGNING_TYPE", "unknown")
-    for task in tasks:
-        if xpi_type not in FORMATS:
-            continue
-        dep = task["primary-dependency"]
-        task["dependencies"] = {"build": dep.label}
-        artifact_prefix = dep.task["payload"]["env"]["ARTIFACT_PREFIX"].rstrip("/")
-        if not artifact_prefix.startswith("public"):
-            scopes = task.setdefault("scopes", [])
-            scopes.append(f"queue:get-artifact:{artifact_prefix}/*")
-        xpi_name = dep.task["extra"]["xpi-name"]
-        # XXX until we can figure out what to sign, assume
-        #     `{artifact_prefix}/{xpi_name}.xpi`
-        path = f"{artifact_prefix}/{xpi_name}.xpi"
-        format = FORMATS[xpi_type]
-        task["worker"]["upstream-artifacts"] = [
-            {
-                "taskId": {"task-reference": "<build>"},
-                "taskType": "build",
-                "paths": [path],
-                "formats": [format],
-            }
-        ]
-        task.setdefault("extra", {})["xpi-name"] = xpi_name
-        del task["primary-dependency"]
-        yield task
-
-
-def _get_dependent_job_name_without_its_kind(dependent_job):
-    return dependent_job.label[len(dependent_job.kind) + 1 :]
diff --git a/taskcluster/xpi_taskgraph/single_dep.py b/taskcluster/xpi_taskgraph/single_dep.py
deleted file mode 100644
index ba3aebc..0000000
--- a/taskcluster/xpi_taskgraph/single_dep.py
+++ /dev/null
@@ -1,45 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-import copy
-
-from voluptuous import Required
-
-from taskgraph.task import Task
-from taskgraph.util.schema import Schema
-
-schema = Schema({Required("primary-dependency", "primary dependency task"): Task})
-
-
-def loader(kind, path, config, params, loaded_tasks):
-    """
-    Load tasks based on the jobs dependant kinds.
-
-    Optional `only-for-attributes` kind configuration, if specified, will limit
-    the jobs chosen to ones which have the specified attribute, with the specified
-    value.
-
-    Optional `task-template` kind configuration value, if specified, will be used to
-    pass configuration down to the specified transforms used.
-    """
-    only_attributes = config.get("only-for-attributes")
-    task_template = config.get("task-template")
-
-    for task in loaded_tasks:
-        if task.kind not in config.get("kind-dependencies", []):
-            continue
-
-        if only_attributes:
-            config_attrs = set(only_attributes)
-            if not config_attrs & set(task.attributes):
-                # make sure any attribute exists
-                continue
-
-        job = {"primary-dependency": task}
-
-        if task_template:
-            job.update(copy.deepcopy(task_template))
-
-        yield job
diff --git a/taskcluster/xpi_taskgraph/test.py b/taskcluster/xpi_taskgraph/test.py
deleted file mode 100644
index 04ee7e9..0000000
--- a/taskcluster/xpi_taskgraph/test.py
+++ /dev/null
@@ -1,52 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-"""
-Apply some defaults and minor modifications to the jobs defined in the build
-kind.
-"""
-
-from copy import deepcopy
-import json
-import os
-
-from taskgraph.transforms.base import TransformSequence
-from xpi_taskgraph.xpi_manifest import get_manifest
-
-
-transforms = TransformSequence()
-
-test_count = {}
-
-
-@transforms.add
-def test_tasks_from_manifest(config, jobs):
-    manifest = get_manifest()
-    for job in jobs:
-        for xpi_config in manifest:
-            xpi_name = xpi_config["name"]
-            for target in sorted(xpi_config["tests"]):
-                task = deepcopy(job)
-                test_count.setdefault(xpi_name, 0)
-                test_count[xpi_name] += 1
-                task.setdefault("extra", {})["xpi-name"] = xpi_name
-                env = task.setdefault("worker", {}).setdefault("env", {})
-                run = task["run"]
-                if "directory" in xpi_config:
-                    run["cwd"] = "{checkout}/%s" % xpi_config["directory"]
-                    extra = task.setdefault("extra", {})
-                    extra["directory"] = xpi_config["directory"]
-                else:
-                    run["cwd"] = "{checkout}"
-                run["command"] = run["command"].format(target=target)
-                task["label"] = f"t-{target}-{xpi_name}"
-
-                task["worker"]["docker-image"]["indexed"] = xpi_config["docker-image"]
-                if os.environ.get("XPI_SSH_SECRET_NAME", ""):
-                    artifact_prefix = "xpi/build"
-                else:
-                    artifact_prefix = "public/build"
-                env["ARTIFACT_PREFIX"] = artifact_prefix
-                if xpi_config.get("install-type"):
-                    env["XPI_INSTALL_TYPE"] = xpi_config["install-type"]
-                yield task
diff --git a/taskcluster/xpi_taskgraph/worker_types.py b/taskcluster/xpi_taskgraph/worker_types.py
deleted file mode 100644
index 0a7b93b..0000000
--- a/taskcluster/xpi_taskgraph/worker_types.py
+++ /dev/null
@@ -1,50 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-from voluptuous import Required
-
-from taskgraph.util.schema import taskref_or_string
-from taskgraph.transforms.task import payload_builder
-
-
-@payload_builder(
-    "scriptworker-signing",
-    schema={
-        # the maximum time to run, in seconds
-        Required("max-run-time"): int,
-        Required("signing-type"): str,
-        # list of artifact URLs for the artifacts that should be signed
-        Required("upstream-artifacts"): [
-            {
-                # taskId of the task with the artifact
-                Required("taskId"): taskref_or_string,
-                # type of signing task (for CoT)
-                Required("taskType"): str,
-                # Paths to the artifacts to sign
-                Required("paths"): [str],
-                # Signing formats to use on each of the paths
-                Required("formats"): [str],
-            }
-        ],
-    },
-)
-def build_scriptworker_signing_payload(config, task, task_def):
-    worker = task["worker"]
-
-    task_def["tags"]["worker-implementation"] = "scriptworker"
-
-    task_def["payload"] = {
-        "maxRunTime": worker["max-run-time"],
-        "upstreamArtifacts": worker["upstream-artifacts"],
-    }
-
-    formats = set()
-    for artifacts in worker["upstream-artifacts"]:
-        formats.update(artifacts["formats"])
-
-    scope_prefix = config.graph_config["scriptworker"]["scope-prefix"]
-    task_def["scopes"].append(
-        "{}:signing:cert:{}".format(scope_prefix, worker["signing-type"])
-    )
diff --git a/taskcluster/xpi_taskgraph/xpi_manifest.py b/taskcluster/xpi_taskgraph/xpi_manifest.py
deleted file mode 100644
index f469a38..0000000
--- a/taskcluster/xpi_taskgraph/xpi_manifest.py
+++ /dev/null
@@ -1,110 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-
-from copy import deepcopy
-import json
-import os
-import pprint
-import re
-import time
-from datetime import datetime
-
-from taskgraph.config import load_graph_config
-from taskgraph.util.schema import validate_schema
-from taskgraph.util import yaml
-from taskgraph.util.memoize import memoize
-from taskgraph.util.readonlydict import ReadOnlyDict
-from voluptuous import ALLOW_EXTRA, Optional, Required, Schema, Any
-
-
-BASE_DIR = os.getcwd()
-# Allowed characters in indexes, plus `:`, which we replace with a `-`
-TEST_NAME_REGEX_STRING = r"""[^a-zA-Z0-9:_-]"""
-TEST_NAME_REGEX = re.compile(TEST_NAME_REGEX_STRING)
-
-
-def check_manifest(manifest_list):
-    messages = []
-    xpi_names = {}
-    for manifest in manifest_list:
-        xpi_names.setdefault(manifest["name"], []).append(
-            manifest.get("directory", ".")
-        )
-        for test in manifest["tests"]:
-            if TEST_NAME_REGEX.search(test):
-                messages.append(
-                    "Illegal test name in {}: {} !\nIllegal char regex: {}".format(
-                        manifest["name"], test, TEST_NAME_REGEX_STRING
-                    )
-                )
-    for k, v in xpi_names.items():
-        if len(v) > 1:
-            messages.append(
-                "Duplicate xpi name {} in directories {}\nTry renaming your xpis.".format(
-                    k, v
-                )
-            )
-    if messages:
-        raise Exception(
-            f"Found the following issue with the package.json(s):\n{messages}"
-        )
-
-
-@memoize
-def get_manifest():
-    manifest_list = []
-    for dir_name, subdir_list, file_list in os.walk(BASE_DIR):
-        for dir_ in subdir_list:
-            if dir_ in (".git", "node_modules"):
-                subdir_list.remove(dir_)
-                continue
-        if "package.json" in file_list:
-            # The presence of a "package.json" file in the repository
-            # does not necessarily mean there's an addon to sign. We
-            # need to give the ability to repository owners to turn off
-            # signing for non-addon "package.json" (e.g. libraries).
-            if "dontbuild" in file_list:
-                continue
-
-            manifest = {"tests": []}
-            if "yarn.lock" in file_list:
-                manifest["install-type"] = "yarn"
-            elif "package-lock.json" in file_list:
-                manifest["install-type"] = "npm"
-            else:
-                raise Exception(
-                    f"Missing yarn.lock or package-lock.json in {dir_name}!"
-                )
-            if dir_name != BASE_DIR:
-                manifest["directory"] = dir_name.replace(f"{BASE_DIR}/", "")
-            with open(os.path.join(dir_name, "package.json")) as fh:
-                package_json = json.load(fh)
-            for target in package_json.get("scripts", {}):
-                if target.startswith("test") or target == "lint":
-                    manifest["tests"].append(target)
-            manifest["name"] = package_json["name"].lower()
-            manifest[
-                "docker-image"
-            ] = "xpi.cache.level-3.docker-images.v2.node-16.latest"
-            if "docker-image" in package_json:
-                manifest["docker-image"] = (
-                    "xpi.cache.level-3.docker-images.v2.%s.latest"
-                    % package_json["docker-image"]
-                )
-            manifest_list.append(ReadOnlyDict(manifest))
-    check_manifest(manifest_list[:])
-    return tuple(manifest_list)
-
-
-def get_xpi_config(xpi_name):
-    manifest = get_manifest()
-    xpi_configs = [xpi for xpi in manifest if xpi["name"] == xpi_name]
-    if len(xpi_configs) != 1:
-        raise Exception(
-            "Unable to find a single xpi matching name {}: found {}".format(
-                input.xpi_name, len(xpi_configs)
-            )
-        )
-    return xpi_configs[0]