Sir, this is Lemmy, the default os is Linux here.
I checked the post history of @whyNotSquirrel@sh.itjust.works and I saw they commented once in linuxmemes, so I assumed it’s about Linux. Also on Windows it’s much more easier to change this, there is another dropdown literally next to the language selector.
It’s not the browser but the websites.
Two way video streaming will be always resource intensive.
But for the other websites the choise is yours, you don’t have to use amazon or goog, there are alternatives.
Also if you doesn’t have enough ram close the tabs. My 10 years old low end laptop with 8GB ram, I know I can’t have more than 6-8 tabs open at the same time.