> Try to do that in incognito mode after a crash.

That argument makes no sense. Both bookmarks as well as persistent tabs are not something you'd use in incognito mode. Also, if you use incognito mode for anything that should survive a crash you're probably using it wrong. Firefox and Chrome let you use separate profiles for a reason.

> 300 tabs! I guess there is nothing more to discuss.

No need to be condescending. Especially not considering a few years ago I also thought it's crazy. Truth is, it's simply how bookmarks should have been designed from the start. If you disagree that doesn't bother me, but your point about browser crashes is still not accurate.