I don't know if this goes in the tabs section or the add-ons section, so I placed it here in tabs. I have tab mix plus and this is what happened to me recently: I just started firefox; it asked me to restore tabs and I said 'yes', but,all the tabs were blank. I thought this was an error, so I closed Firefox and restarted and now the sessions won't ask me if I want to restore to previous session. After fiddling with it I broke down and started a new session. Got the essentials and such, closed firefox and it asked me if I want to save and I said 'yes'. When I went to open firefox, nothing happened. It didn't ask me to restore the session or anything. I checked session manager and the sessions before the one that I just did (the sessions that were there when the bug happened) were there and session manager still isn't working. Thanks for your help.