Firefox is using too much memory and cpu, results in crash

Well I suppose that is relative to a) what your hardware is and b) what you use Fx for, many tabs etc.

There are others who say the same. I have a Rasp Pi 4 with a version of Debian 8Gb RAM simple CPU an Intel 11G67 with 16GB Ram an Android 13 Phone with 4GB RAM

I don't check the usage as they all work. I have been using computers since 1986 so maybe I have learnt not to expect too much I don't play online games.

OK Just checked basics on my Win11 IntelG67 with 16Gb. Just two tabs open. See screenshot

P8-77v with i7-2600k 3.4Ghz and 16Gb ram

That will account for a bit, but then I use Fx on the little Raspberry Pi

So it seems maybe you use

https://cpu.userbenchmark.com/Compare/Intel-Core-i7-2600-vs-Intel-Core-i7-1165G7/620vsm1195374

Have you cleared the cache lately, history | site data | cookies etc.

I switched to Chrome. Problems are gone now. No issues running Chrome.