Get the add-on from the Mozilla add-on page.
Having a lot of X-Plane addons can be confusing sometimes and hard to manage. This plugin-manager allows you to add plugins from forums.x-plane into a popup, where crucial plugin information as the name, installed version and current version will be shown. This creates a simple overview over all plugins and informs users of new updates of added plugins. It is also possible to add custom plugins from different websites. Plugin information can't be determined automatically though and users have to check for updates manually.
This Add-on is still work in progress and currently only works in Firefox and Chrome.
Please report any bugs or issues here.