Hashtag late but Firefox’s main downsides is that it’s tab flushing sucks compared to Edge, and there’s no native vertical tabs.
In Edge, if a tab is put to sleep, clicking it again does not require a full refresh. Why does it need to completely reload in Firefox?
I’m aware there’s extensions for tab groups and vertical tabs (I’m using Simple Tab Groups), but it should be a natively supported feature.
Add that to the fact that Firefox is now the web developer equivalent of IE6 circa 2010 - minuscule user base and requires weird hacks to get websites to look good on it - and you got a recipe for people not wanting to use it.
Also lying about being the privacy focused browser when it has a bunch of telemetry and a bundled sponsored extension I had to look up how to get rid of, that part sucks too.
It doesn’t save form inputs because when you click a suspended/unloaded tab, it reloads the whole page. Everything unsaved on that page is lost.
I really hope some day Firefox will work the way you say, though.