Dell laptop w/8gb RAM, using Firefox w/115 open tabs (some Utube), Edge w/6 open tabs, T-bird, Libre Office w/2 spreadsheets, and 1 WordPad doc open. Also have McAfee running.
This is my normal usage. Lots of surfing, write some docs, print a few things. I'll put it to "sleep" at night by closing the lid. Might reboot the laptop every couple of weeks or 3, unless an upgrade to something drops.
Haven't noticed any memory problems.
There are only 2 reasons I use Edge: 1) work website doesn't like Firefox; 2) .pdf's display & print better from it than Firefox.
BTW: If using FF go to Options --> Privacy & Security
Scroll down to Firefox Data Collection and Use
Turn that crap off, particularly Allow Firefox To Install And Run Studies
Thanks!