Earlier quoted context omitted.
Firefox is good. It has support for modern standards, is performant, has tracking protection built in and plenty of extensions. Google is winning because it's bundling its browser just like Microsoft used to and is aggressively advertising it on all of its web properties, which might have a reach of close to 100% of the web-using population. Firefox also has a reputation for being slow, gotten probably from people do…
> Firefox also has a reputation for being slow, gotten probably from people doing ridiculous things as keeping tens of tabs open and not restarting it for dayes Do you mean it has the reputation from people doing this 5 or 10 years ago and it's stuck? Or is this still a problem for Firefox?
However, Firefox will not magically better itself; developers - paid and volunteer - will need to fix issues as they are discovered, and that means that if you run into performance problems, you should file a good bug.
I use both Chrome and Firefox on my Windows 7 box, simultaneously for various reasons.
The Chrome (vanilla install except for uBlock Origin) performance is... not great for me, at least once I get more than 10-15 tabs open, mostly when switching and/or opening tabs. A lot of it seems to be swap-thrashing.
Firefox performance on the other hand is OK to great, even tho it being my main browser with usually 50+ tabs open (with tons of overlap with those Chrome tabs) and rather add-on laden. I am using Nightly since forever, with e10s off at the moment because of one or two add-ons that would fail otherwise; tho I also have Firefox Stable installed and when I use that it behaves the same.
Sure, webgl and/or js benchmarks might be a little behind on Firefox (tho not by a large margin). So that nifty html5/webgl 3D ego shooter might perform a little worse, but that is nothing I personally really care about. Firefox excels for me for regular browsing performance, and that is what I want.
Chrome on OSX always performed abysmal for some reason, so I am using Firefox (Nightly) exclusively on a recent MacBook Pro, which runs fine (sans the occasional memory swap/uncompress stutter when switching back to really old tab that got paged out).
I cannot comment much about startup performance as I usually have long-running sessions in the order of days or weeks, but it seems OK for both browsers.