TIL that if Firefox (or, in this case, a third-party build thereof) pops up the session restore page on launch and you accidentally tap the "close" button instead of "restore", it chucks out the session and turns off the "open previous session" option, meaning those tabs are just plain _gone._
Thanks, Firefox.
Thirefox.
@ElectricKeet this is one reason we've ended up with a third-party session manager on every browser we use anyway. :(
@ElectricKeet A way to avoid that is just find the setting that whenever you open Firefox, it re-opens everything you had open when it closed last.
I used to do that 'restore session' dance with Chrome until I did that option instead.
The caveat is that it then is loaded every tab so startup takes some time.