Broken in Firefox 20.0 Waardering 1 van 5 sterren

I just upgraded to Firefox 20.0 moments ago, and LastTab no longer works. CTRL-TAB just navigates to the next tab to the right, and clicking on the tab you're currently on no longer takes you to the previous tab you looked at; instead, nothing happens.
Looks like I'll be looking for a replacement, after all these years.