I have quite a few more tabs open at any point in time including some large spreadsheets so 8GB tends to be my minimum before I start noticing on Windows/Firefox even with an M2 SSD. Firefox alone is at 4GB for me. This is also my fault for not snoozing/bookmarking aggressively.

i run intelij idea, firefox, dbeaver, spotify, and a regular python stack and that's enough to consume the 8gb ram that i have on my matebook 13. and when all ram is consumed and it hits swap it's so slow that i get hicups, and that with ssd. i tweaked idea to use less ram, and if and i can keep it below 7.x it works ok. i have no idea how u can use anything with 4gb. on my macbook it's the same but i dont get hickups if i hit more then 16gb on my machine.