It would be interesting to see performance figures for Firefox + uBlock Origin vs Chrome and all the advertising/tracking junk it has to drag down to render some well known sites.

I'd bet the cost of all those network calls outweighs anything else in the rendering pipeline.

On Linux you may also want to consider an alternative browser for performance and battery saving. The recent addition (Firefox 115 I believe) of hardware accelerated video decoding should make things better, but I'm still regularly seeing 50-90% CPU for a tab just playing a Youtube video that my Intel GPU should be decoding. I can tolerate that on desktop, but on my laptop I want to preserve battery life.

I'm not sure why but Linux also seems slower in Firefox's benchmarks. My guess is that Mozilla is optimising for their most common users (and Linux users have a high probability of picking Firefox anyway). Hopefully more Windows features will make it into the Linux build soon.

FF is definitely my fave on Mac (containers/no history mode), but Safari isn't that much worse and I have almost zero problems with ads using Wipr content blocker.