It was only true that Chrome was significantly superior (performance-wise, anyway) for a little while. Firefox had to play catch up and it took several years. It was (mostly) called the "electrolysis" (a.k.a., "e10s") project. It was considered complete by 2018, and had already offered significant performance and stability improvements for years before then.
I wouldn't be surprised if Chrome still performs better on Google-owned web sites, for obvious reasons. But, nobody is really going to notice a difference between Firefox and Chrome when visiting, e.g., your bank's web site.
So, it's been somewhere between six and eight years that Firefox has had comparable performance, comparable web dev tools, and way cooler extensions. I'm sure plenty of people will reply that this isn't true and there was some website just this week that FORCES them to stay with Chrome because they noticed a jitter once, but people on the internet are top-tier experts at rationalizing and I don't buy it.
We could've all jumped on board with Firefox when the e10s project landed, but nobody did because it was just slightly less convenient to switch than to not. I hope it was worth it for them.
Chrome had better stability (not sure about performance) for nearly a decade - far more than "a little while". I gave Mozilla 3-4 years to catch up before finally switching to Chrome.
Even once e10s supposedly fixed their problems another 4 years down the road, I didn't see any reason to rush back. I've switched to another Chromium browser, but I'd rather try a new engine entirely like Ladybird than switch back to Mozilla, until they prove they're not going to let the browser stagnate for so long again.
The one that is the worst for me is Google Cloud console. It takes tens of seconds to update page state when trying to create or edit resources in Firefox, especially anything in Compute Engine. Chrome feels reasonably snappy, at least as good as AWS's console. I'm not sure who is to blame for that but I use `chrome-new` to log into Google Cloud when I need to.
Imagine browsing the web without an adblock. A single ad can consume 1GB in 5 minutes on my mobile phone. The CPU will be super slow. We often underestimate the loss of performance that ads represent.
Well, that’s going to be Chrome from now on.
> I wouldn't be surprised if Chrome still performs better on Google-owned web sites, for obvious reasons.
Most websites (except for those doing some really fancy stuff with new experimental web apis) tend to work just fine in Firefox. Google's sites are the only ones I regularly encounter that perform terribly and leak memory continuously.