Hi, I added the following keyboard shortcut in version 1.8: Alt+Shift+Left Arrow. Using Ctrl+Alt+Left Arrow might be more comfortable. You can change it through the Add-ons page. See: https://support.mozilla.org/kb/manage-extension-shortcuts-firefox
Had this addon installed for a while and i really like it. It makes up some way for when I used to a able to click on a tab to return to previous. Tab mix plus I think.
