I must have just got an update to V33 because I was not seeing this problem before today. I have not myself been messing with the configuration in the last couple of weeks. (Not sure when the last time I actually closed Firefox successfully, but it was definitely within the last 3 days.) Looking at Submitted Crash Reports, I see just one on 10/3 and then 53 of them spanning the interval from 7PM to 8PM this evening, during which I had had to kill it from the Task Manager 3 times because it was just hanging when it was supposed to be shutting down. Here is a small sample: af0c75a7-feaf-4ad3-aae2-81ddeedeaaaf 10/18/2014 8:00 PM f0309bc5-4bc8-435f-9f33-aa2c6bb3a09d 10/18/2014 8:00 PM 02906c47-fc27-4559-b735-093215ac92b5 10/18/2014 8:00 PM 302fce44-9e80-440c-8f79-241b3a3d8328 10/18/2014 8:00 PM Firefox seems to be working normally when I restart it. I really do not want to have to do a reset to fix this. However, if I were to have to, would Sync put things back? Is reverting to V32 an option? If so, how? I'd appreciate any help.