I've been using it for some of my work for a few months now, after a multi-year hiatus because it always, no matter which version I installed, slowed to a crawl after a short while of use. Now that I've restarted using it.......... Same damn thing as before: If I open more than a couple of tabs and leave it running for a couple hours, the whole thing slows to a crawl. This problem has persisted for me across nearly a dozen laptops over several years. I don't think it's specific to something I'm doing wrong. (though I'm happy to be corrected on this so I can finally fix that thing and use firefox regularly)

Chrome on the other hand can be open with dozens of tabs (yes I'm a tab hoarder, sorry) and run just fine. I don't like Google in so many ways, but damn is it hard to argue against using chrome over FF when FF keeps being so damn stupidly shitty on lightness of use.

My daily work laptop is admittedly pretty low-spec, but if one damn browser doesn't make it crawl, why should it be so hard for the other damn browser that promotes itself so heavily to pull off the same thing?

Conclusión from this little corner of the browser user space: Firefox, get your shit together finally please? It's been over a decade, you've had plenty of time to stop fucking basic things like lightness of performance speed up.