Older versions of Firefox allowed the user to save all open tabs to a folder in Bookmarks with one touch (not laboriously bookmarking each tab), so if Firefox did not remember your tabs when re-opening your browser after closing down for the night, you could at least re-open each tab if you'd been clever enough to save them to a Bookmarks folder. I still have my Bookmarked folders full of tabs from previous months, so I know I'm not imagining this useful Bookmark function.

I cannot find this function, Save All Tabs (I think that's what it was called,) under Bookmarks anymore.