I agree that I just need to try it - I hadn't meant for this question to open up so many complex replies - I just figured someone who had actually used Waterfox, which it doesn't seem anyone does (And thanks for the tip about the latest Waterfox release in there) would reply.
I don't run 3000 tabs, but I certainly run a few hundred at once, though I don't run multiple browsers really because I find my addons and bookmarking aren't unified which I find annoying. I certainly think there are better 'ways' to solve the problem I want solved (I was hundreds of webpages immediately accessible when I click on them, and I want them all displayed in a list (so tabs) that's constantly viewable. It's not that outlandish a feature request, and every browser can do it in fact - they just destabilize the more tabs you load - I want to be able to use hardware to fix that - this is akin to playing a game, but wanting to play it at a higher framerate - people use hardware to improve their software VERY commonly - nothing new.
My main uses are research (where I like every tab open to say an article or page), regular long-term browsing - so for instance I was buying/comparing auto parts, but they're expensive, so I was aggregating them in one browser window together so I could order them all at once when I had the necessary funds - this took up about 30 tabs right there - I wanted every part open and on display so 3 weeks later when I came back I could just flip through them and my final purchase decisions. There's nothing weird about wanting to do that. Now assume I'm extremely hyperactive and work on about 25 personal projects at once, each having web-data I want to open and being unrelated to each other.
Also, just more generally, if I have the RAM (I take the above poster's technical points), I still want/should be able to run more tabs if I so choose.
I get that there are in principle other ways of solving my problems using less tabs - I can use addons, like one which saves the entire tab set to reload at a later date - which I do, I can bookmark, which I do, or of course I could just write all this down and not use the browser as much at all...
Since I have so much RAM, I see no reason why not using it to run more tabs if that's how my productivity is best served for my particular usage cases. I'm not implying that everyone needs them (obviously they don't since no browser is designed for this according to the poster above).
Obviously though, the best solution is to just write my own browser...
