This is anecdata, of course, take with a pinch of your preferred flavouring powder.
Windows even runs (semi-playably) 2020's shooters in this condition, though you need to kill any windows close to the tab limit that are full of recently opened tabs.
[Yes, I know, the horror]
> Chrome also came in at slightly lower memory consumption across all the benchmarks with total memory usage on average at 4.67GB to Firefox at 4.83GB.
Well, it does require you to install an extension[0], but it can be done.
I've been using Grayjay recently which does allow that, amongst a number of other useful features (integrating other media sources, lack of adverts every few minutes in some content). Might be worth considering as an option.
Don’t know about android, but there is also an extension there that blocks the visibility page api for YouTube.
You also get ad filtering and you can download Audio/Video streams from within the app.