Why did multiple tabs just randomly disappear from my main window?
I ran into a glitch in another program, and as part of trying to fix it I rebooted my computer. On doing so, I find that the VAST majority of the tabs I had open in my main browsing window have disappeared - some of them out of tab groups I'd created to avoid losing the tabs in question. Neither tab history nor browser history show the missing tabs.
What gives?! Is there any way to restore the window as I had it, say, yesterday?
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Just to confirm, have you checked history -> recently closed tabs, recently closed windows?
If not, please check out the reply in https://support.mozilla.org/en-US/questions/1407584
To recover closed tab groups, try the "List All Tabs" button (usually at the right end of the tab bar, before the Windows buttons): 
I checked under recently closed tabs & recently closed windows, no luck.
I wound up restoring from the js backups.
hobbitguy1420 said
I checked under recently closed tabs & recently closed windows, no luck.
True, those don't list saved/closed tab groups. If you check right now, are your tab groups listed on the List All Tabs drop-down?
I wound up restoring from the js backups.
Which backups are those? Files in sessionstore-backups?
I did just add tab group recovery to my Scrounger tool, but that just gives you a list and can't un-hide them in Firefox itself.