Hi, RATHER FRUSTRATING... I just upgraded to v 35 and all my tabs and history is gone. I'm on Mavericks. Settings: Under Preferences/General, I had selected (and still have selected), show my windows and tabs from last time Under Preferences/Privacy, I had and still have UNCHECKED, 'clear history when firefox restarts'. Once I did the upgrade, it has blown away my history and I only have history older than 6mths. No recent history at ALL! What gives?? What's worse, with the above mentioned setting in place, if I open two tabs (say one to Microsoft and the other to Apple), when I exit and restart FF, I get a clean install. The tabs from the last session DONT'T get restored!!! It seems the restoration after an upgrade is a CRAP SHOOT with FF. I have had this happen in the past and usually reluctant to do upgrades. Which is not a good thing. This time seeing the focus on security, I elected to the upgrade, after I had checked all the settings were in place. Unfortunately, it screwed me right up! What can I do? Thanks jafirefox