Version for Firefox 12 Rated 5 out of 5 stars
Now updated and tested version to work with Firefox 12. I don't have time to slog through the mess that is the Mozilla Add-Ons submission process. You can download it from here if you want it: http://electronplumber.com/tabsidebarreloaded/
Rated 5 out of 5 stars
I got so sick of this AMAZING addon never being updated that I took it upon myself to do it!
That's right folks, Tab Sidebar LIVES AGAIN! Updated to work with Firefox 4+, tested against Firefox 9.0.1.
Find it at http://addons.mozilla.org/en-US/firefox/addon/tab-sidebar-reloaded/