Added button to remove all selected tabs.

Make addon button default to navbar.

When navigating to a new site, you can tell the addon to automatically put certain urls/titles into a group.

• `//` creates a comment for that line. Must appear at the front of the line.
• `[]` sets the group that next matches will point to. Use empty brackets to denote that matches should be uncategorized (or place it at the start of the rules).
• `!` tells the auto grouper to match the title instead of the url.


url_match_for_uncategorized
// This is a comment.
[Group Header]
url_match
!title_match


Tab list now scrolls to active tab when popup is first opened. Also added "Return to active tab" button.
Added filter for duplicate tabs.
Url is now shown when you hover over a tab in the popup.
Search filter now searches the url too.
Added temporary workaround for https://bugzilla.mozilla.org/show_bug.cgi?id=1817287

Fixed badge not showing up on browser startup.