brave has tab groups now, so you can organise those things a lot more cleanly as well, and firefox has still not implemented this feature, so, i understand what you mean but i have over 100 tabs tied to several different browser tab groups now and i don't get problems with that
i will just say that i'm not sure how much memory you need, maybe it is more, but 16gb of memory should be enough to run brave nicely on a linux installation