I like Firefox a lot (with Privacy Badger and uBlock) but sometimes the browser slows to a crawl. New tabs are slow to open, takes way too long to select and activate a text input field, and so on. A restart fixes this, but it's still annoying.
I think I might go back to Safari. I like the way it looks and it feels snappier all the way around.
Try installing the auto tab discard addon (It is a recommended addon so it gets checked by Firefox). I’ve noticed certain tabs may slow FF down if they aren’t unloaded in the background.
I had FF slow to a crawl and when I checked it was using 7gb’s of ram. Turns out a site I had turned off uBO in had opened up a sub frame that was blasting ads. So it is interesting to try to see what is going on with about:processes.
Safari is at a disadvantage - it's behind a walled garden and people outside of that garden don't develop or test for it. Sure, that's a trivial issue for a company but not for small team or single person projects.
Not to mention that it feels like Safari is only fast because it does its own thing and doesn't strictly follow the spec. I've often run into CSS specific issues with it when making slightly more complicated animations.
Do you use tabs as bookmarks? Use bookmarks instead, tag em for extra convenience in one go. Together with ctrl+h (history) you can go back to any site you recently visited.
I think I might go back to Safari. I like the way it looks and it feels snappier all the way around.