I use Firefox on MacOS. It is easily as fast as Chrome for me (and I have tons of tabs open in multiple windows). And I use Google Docs/Sheets/etc. all day long with zero slowdowns.

I'm on macOS and Firefox is at least as fast as Chrome. Granted, I'm on nightly with WebRender turned on, but that will be in regular Firefox soon enough.

Yep, can confirm that FF is still killing my 2014 MBP.

Other than some Google sites optimized for Chrome (which reminds of sites working only in IE...), Firefox on MacOS works pretty well, better than Chrome on average. Safari on MacOS is probably the winner, because Apple invests a lot on battery saving and performance of its sw.

The whole Google ecosystem is slow on any platform, including Google platforms (Chromebooks).

I haven't noticed Firefox being any slower than Chrome on MacOS. Then again, I only use Chrome to browse facebook.com, so who knows.