Just looking around reddit you easily pass the 50 tabs threshold.

Bookmarks are far from ideal (at least in firefox) and technically you don't need them today since the history works well in case you need to find something (just typing related terms on the address bar) but the history is erased quite often so it's better to have certain urls bookmarked and using the aforementioned address bar to find what you're looking for (or the search on the bookmarks manager). It works for me.

I have absolutely no idea what you're talking about. I don't use bookmarks, I used to put things in there and never find them when I needed them, so I've stopped doing that.