FireFox uses too much memory. So I use Chrome, Edge and Brave. I do use FireFox a little bit. My main computer is I5-8400 with 16GB Ram. If it had 32GB ram then I could use FireFox in unlimited tabs fashion
https://cloudzy.com/blog/which-browsers-use-the-least-memory/
But 64GB is often maxed out for me with multiple installations of FF portable running concurrently, and w/ hundreds of tabs (forums, shopping, etc.).