v1.5.28lite

Synced with Tab Utilities 1.5.28.

Changes since 1.5.21:
Added: "Invert focus" option for Ctrl-click on Bookmarks/Links
Improved: Allow Ctrl+Tab to jump between groups
Improved: Remember MRU tab order across sessions
Fixed: Allow alt-click to select text inside link [Fx13+]
Fixed: Fix tab closing selection for related tabs [Fx26+]
Fixed: Fix tab highlighting on Australis
Fixed: Change back Undo Close Tab button icon to improve compatibility