I just force quit Firefox because it was slowing the macbook with loads of memory use for nothing much running. On with Chrome... They should that sort of thing?

I have not really ever had this issue, and I use Firefox Developer Edition on an M2 Macbook Pro every work day.

I have it too. If you leave firefox running for weeks at a go, it is really bad at returning memory to the OS. m3.

Ah - maybe my extensions or something.