Something is F'ed with your system. I have 10 extensions installed, nearly 900 tabs (most of which aren't actually cached) and my Firefox stays open for weeks and it still never uses more than a few GB of RAM.

I have a 14gb VM, Sublime Text, VS Code Pycharm, and Hexchat all at open the same time.

The memory usage isn't amazing but it's not terrible. If I go to about:memory and do a report, it seems that nearly all of it is going to Google websites despite being the vast minority of my open tabs. Gmail, Gchat, and Youtube.

So I'm not going to sit here and blame Mozilla because Google websites in particular are hogging a lot of memory.

Good for you. Meanwhile I just had to restart Firefox because it pegged a CPU core at 100% and wouldn't refresh.

And this was after nuking the configs and doing an "sudo apt purge firefox && sudo apt install firefox"

No offense, but I use Firefox across windows, Linux, macOS, and Android without any problems. I suspect you're seeing hardware issues or just trolling. Firefox may not be perfect but shouldn't behave the way you're describing. I agree it's not as fast as blink based browsers, but the issues you're calling out are not common unless your system is doing something weird to break it.

I don't agree with assuming he is trolling.

Well I guess he could open an issue if that’s the case?