Try add new tab without animation
Ignore, if tab moved to another window
Restore original tab (or load it's URI) after click on folder icon in about:treestyletab-group?title page
(draft for #1)
Make folder icon focusable to allow use keyboard
(still draft for #1)
Fix typo (all worked fine due to bug 620541)
https://bugzilla.mozilla.org/show_bug.cgi?id=620541
(#1)