Fix firefox fullscreen tabbar, screenshot to clip

The fullscreen mode in firefox showed the customized tab bar.
This behaviour has been removed and the tabbar remains hidder in
fullscreen.

A new shortcut for i3 to capture screenshots in rect and save to clipboard
to paste later has been added.

firefox/chrome/userChrome.css

@@ -145,7 +145,14 @@ toolbox:focus-within > #nav-bar,
   background-image: none !important;
 }
 
-html[inFullscreen="true"] #urlbar,
-html[inFullscreen="true"] #navigator-toolbox {
-  display: none;
+html[inFullscreen="true"] #TabsToolbar {
+  margin-bottom: -100px !important;
+  opacity: 0 !important;
+  height: 0 !important;
+}
+
+html[inFullscreen="true"] #TabsToolbar:focus-within {
+  height: 30px !important;
+  opacity: 1 !important;
+  margin-bottom: 30px !important;
 }

i3/config

@@ -77,6 +77,7 @@ bindsym $mod+Shift+d --release exec "killall dunst; exec notify-send 'restart du
 bindsym Print exec --no-startup-id i3-scrot
 bindsym $mod+Print --release exec --no-startup-id i3-scrot -w
 bindsym $mod+Shift+Print --release exec --no-startup-id $HOME/dotfiles/scripts/screenshot_rect.sh
+bindsym $mod+Ctrl+Print --release exec --no-startup-id maim -s -u | xclip -selection clipboard -t image/png
 bindsym $mod+Shift+h exec xdg-open /usr/share/doc/manjaro/i3_help.pdf
 bindsym $mod+Ctrl+x --release exec --no-startup-id xkill