Now, most of the developers choose between Chrome and Firefox. And in 2017 Mozilla released their updated version of Firefox — Firefox Quantum with new customization settings, better extensions support, privacy and what's more important — speed. 2x faster than old Firefox and faster than Chrome.
Firefox using their own new engine with new Quantum CSS and Quantum DOM rendering. A lot of explanations here. And Chrome uses a lot of memory, Firefox — less.
Do you scare about extensions? Now, most developers write their extensions for both Chrome and Firefox.
And the final reason — stop the monopoly. Give a chance to other companies that smaller and you can see how frontend develops.
Move all your bookmarks in Firefox for one week and try.