It does release it back to the system. It only doesn’t if you actively have a ton of windows/tabs open, in my experience. Even then, it’ll cache stuff to disk after awhile. Like on my phone, I’ve easily had over 20 tabs open in Firefox (Android) and it doesn’t suck up all of my phone’s ram (which only has 12GB). If your system is running less than 16GB, then that’s another matter and you really should add more, as 16GB is pretty much the baseline on computers these days.
It does release it back to the system. It only doesn’t if you actively have a ton of windows/tabs open, in my experience. Even then, it’ll cache stuff to disk after awhile. Like on my phone, I’ve easily had over 20 tabs open in Firefox (Android) and it doesn’t suck up all of my phone’s ram (which only has 12GB). If your system is running less than 16GB, then that’s another matter and you really should add more, as 16GB is pretty much the baseline on computers these days.