Safari have only 2 platforms (actually one since they share pretty much the same kernel and much of the user space code) to support vs Firefox needs to support 4 (macOS, Android, Linux and Windows). I would be surprised if Firefox was the most battery efficient browser on macOS.

Can you please elaborate on that?

Neither Firefox nor Chrome optimize for battery efficiency like Safari does on Macs or Edge does for Windows.

I’m not trying to be the “just Google it” guy without citations. But I couldn’t find a definitive citation - just general discussions and some YouTube videos including earlier discussions on HN.

I searched for “firefox vs safari battery mac” and the same for Edge on Windows.

Chrome doesn't optimize for battery efficiency like Safari on Macs. It optimizes better than Safari.

https://birchtree.me/blog/everyone-says-chrome-devastates-ma...

They may be referring to the fact that Firefox is probably the worst on battery of the 3 main browsers when used on macOS.

Safari does admittedly set a very high bar though, and only cares about 1-2 platforms at most.

You didn't say "like Safari does" and instead made the bullshit and unsupported claim that they chose not to optimize. That's some uninformed garbage if I've ever seen it.