Basically what the title says. As far as tech knowledge goes, I am probably a 3.5 or 4 out of 10. Hence the ELI5 request.

I am a Firefox browser user, both in my Android phone as well as Windows device - for the same reason as many others ditched Chrome and chose FF (degoogle and all).

Recently I came to know about Fission being offered in FF nightly. It is said that site isolation with fission is far from ready, and this is probably one of the areas where chromium beats it. I read somewhere that FF fission uses multiple processes to separate sites, but they are not really “isolated processes”.

All these is surely not making me less confused about how exactly sandboxing/fission/FPI/TCP differ as far as Firefox is considered, so thought of asking this here.

Posting this in the ELI5 community might’ve been more “correct”, but my question being specifically around Firefox, I thought the chances of getting a better answer is higher here.

Apologies if not, and thanks in advance.