IIRC you have to be careful to open the browser, do an immediate restore or lose the option to restore?
Also I'm not sure just how good a restore is, doesn't it reload the pages rather than remembering the state each page was in (e.g. long web page that takes half an hour to read, user is 60% of the way down, doesn't want to lose their progress).
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chrome's bookmark support historically hasn't been as strong as Firefox's IIRC, I migrated to Chrome in the era that FF's multithreading wasn't good then migrated back once it was fixed to get the better bookmark system. Given how these days software makers copy the crap out of each other, it wouldn't surprise me if FF's bookmarking system has been nerfed to make it look/work more like Chrome.
Like I said, some people use background tabs to preserve state. When you restart Chrome or FF and restore your session, you get all your tabs back but not the prior state.
So bookmarks and session restore can save all your
locations, but that isn't relevant to all the different reasons a person might have for hoarding browser tabs (it could be reading a long, static document but it could also be keeping the last page of a transaction as a reminder to do something else).
It's a funny pivot to go from you need to use bookmarks to organize your pile of tabs to "just delete all your bookmarks."

Obviously most users aren't like igor, but I have a lot of tabs lying around as well (many dozens, not hundreds).