As a developer, I don't typically use browsers as debuggers or programming environments, so I never experienced game-breaking differences.
I can't even switch because one of the vital extensions for my workflow do not exist any more and the author of the Chrome equivalent doesn't want to port it. (I even offered a little money, I probably can't pay enough for an experienced developer to do the full port.)
Wait, you haven't had a security update for your browser since 2017?
Even on a newer computer Firefox feels jagged and hangs. Memory leaks still happening years later. It is so frustrating to see Firefox using 1.5GB of RAM when only 2 tabs remain.
Quantum helped a lot, but it's still not enough for me and many others.
What popular sites don't work in Firefox?
Really? Do you have examples? I haven’t faced this issue. Some websites breaks somehow if you block 3rd party tracking (by breaking I mean that some pictures or video embedded into the page won’t load), but that’s an opt-in feature so I don’t think that’s what you mean.
It would probably take me a bit to figure out exactly how to work with the FireFox advanced debugging tools, but it's familiar territory.
Installing is one click - as simple as the chrome web store.
If you want the ability to unload tabs, firefox struggles with it. The best addon is https://addons.mozilla.org/en-US/firefox/addon/unload-tabs/ but it admits that it is buggy. Haven't tried it though.
Edge & Firefox have also been useful in the same way I once used Opera (special tasks where their features really shine). I really liked Edge's reading mode & for just browsing websites it was great.
What developer tools available in chrome but not firefox?
However for most average Joe's it's fine and won't make a difference, so I always install and recommend Firefox when I play IT guy for family/friends. Time to start doing this again like we did in 2005!! It worked then and it can now!