I don't have the time to organize those thousands of tabs. I heard they introduce tab groups, but I find them very annoying. I occasionnaly "tag group" some tabs, not sure how exactly it's happenning but I just ungroup them.

I don't group them, I don't have the time for that. They should just group themselves. I had an add on that would take all tabs from all windows that were from a particular domain, and pull them out into their own window,, what was very useful, but it broken in a recent update.

tab manager plus does something similar but it's quite a few extra steps, but it can also use search terms to perform the same thing

What possible purpose could you have for that many tabs?

Tab accumulate because I am not willing to give them an evalution to know if I am done with them or not.

Ideally they should get auto sorted by project and date and be able to summon back when I revisit whatever topic this is about. But there's no automatic way to do that which doesn't involved a lot of manual manipulation so I don't. It just blobs up into a mass of 10000 tabs, then I save it into the bookmark folder where they are probably never seen again. Since the bookmark manager as it currently exist, is super useless.