hi, back a month later after posting this ( https://support.mozilla.org/en-US/questions/1387447 ) i didn't get a chance to implement the solution because by the time i had received it, i had already opened everything back up manually, and closed out firefox multiple times (when i first started up and noticed missing tabs), which i presume created a new session. i can soundly say its happened and i think i've pinned down the issue. it seems that when i update firefox, it restarts tabs from around the time of the previous update. is there something that could be causing this? i've scrounged my session back up data, and none of them contain my previous tabs, and my alternate session doesn't either. my actual previous tabs are shown in my recent history, so there should be no reason it opens tabs from august right? this time after the update firefox disabled all of my add-ons and my theme, which it has never done to me before. (i also noticed two login.json from may and june respectively that have been labelled corrupt. could that be an issue? my latest one however, seems uncorrupted, from the day of and day before posting this reply.) if you could kindly help me, please do. thank you in advance.