I had 16 windows open with around 1400 tabs. I discovered OneTab and it seemed like the answer to my prayers as even 16GB RAM struggling with so many open windows. I managed to close 7 windows and around 700 tabs by using the OneTab list. My whole computer shutdown overnight for a Windows update, and when I re-opened all my Mozilla Firefox tabs popped up as usual. (I have a few crashes here and there and never had a problem restoring tabs with normal Firefox windows.) My single OneTab had the option for 'sessionrestore' but when I clicked it, NOTHING, zero tabs and I am gutted. 1. is there a backup file of what was transferred into OneTab? 2. I have not synced, can I restore my whole Mozilla account to where I was 3 days ago with 16 windows open? 3. There is nothing in recently closed tabs/windows - is the only way to go back through my whole browsing history for the last 6 months and restore that way? 4. I cannot do a full computer system restore as been deleting files and other work - I must find a solution through Mozilla. How can I get back in time? Anyone able to help or advise? Much appreciated!