Firefox is awesome now. We can celebrate that without rewriting the past.
Chrome’s approach enabled new things and I knew somebody was mgoing to /r/iamverysmart about my example being a Google app—but Google Docs is my go-to example exactly because at the time nobody else really made a web app with some weight to it. Chrome enabled them to be mainstream and for that it deserves a lot of credit. But there is no super secret MakeFirefoxSlow.js in Google Docs. There never was. Firefox was slow and poorly designed by comparison.
Firefox has now improved. It’s great. I don’t even use Chrome anymore. But I’m really allergic to this kind of galaxy-braining.
https://fortune.com/2018/07/25/youtube-slow-mozilla-firefox-...
https://www.theregister.co.uk/2018/12/18/google_monopoly_abu...
Mozilla certainly improved on overall performance with Quantum, but to say Firefox was unusuable is actually not even an exaggeration - I stand corrected on this - but plain wrong.
AFAIK, Chrome did introduce the multi-process approach but that touched tabs only peripherally. Tab management itself has not improved.