Add toolbar button that just changes 'Favorites'

[ThatOneGuyDotNet]

Automatically install it for first time users:
https://developer.mozilla.org/en-US/docs/Code_snippets/Toolbar#Adding_button_by_default

Text should be "QJ", need a grey color if some are disabled and some are enabled.

This button could also be of type menu-button and display all of the other options so users would only need one button:
https://developer.mozilla.org/en-US/docs/XUL/toolbarbutton#a-toolbarbutton.type

[ThatOneGuyDotNet]

Done in V2.0