Long story short I've lost about 30-40 tabs and can't get them back. What happened was that my computer was being strangely slow, so I opened task manager to close some stuff with one of them being firefox. I had about 6 windows open, 2 of them having a lot of tabs, the other 4 only having a few. Reopened firefox, click restore previous session and only 3 windows reopen. I've never had this before and am scrambling to try to fix it as the tabs/windows that did not reopen are the ones that were actually important. I've tried to use the scrounger thing that jscher2000 has suggested and haven't been able to find anything (I don't know much about code tho so could probably be missing something). I don't know what to do and am panicking a little as like I said, those windows that did not reopen were important. I'm trying to figure out if firefox saves older versions of the session restore .jsonlz4 files (besides the .baklz4) but they seem to just be overridden/deleted. Is there anything I can do or am I just screwed? Also recently closed windows and tabs options are empty when looking at the history tab, which has also never happened. New update today so could it be that that has caused this problem? Finally, I've looked at the Import and Backup -> Restore option, which has worked for me once when something similar happened, and between Saturday morning and now (Tuesday), there is nothing, which is odd as I close out all my tabs every night and this morning everything was restored perfectly. Yesterday is when I opened a lot of the important tabs for the one window, so could there be some kind of glitch occuring there? Any help would be appreciated Thanks