Actually there is no proof showing Chrome works more efficiently than Firefox, especially provided with same computer resources. BTW, Thunderbird is restarted.
Proof? I don't know, but anecdotally... My late 2013 Macbook Pro Retina is still my work machine, I attach it to two screens, one of which is a 4K screen. Firefox struggles to play embedded video on that screen. Chrome does not. FF also seems to have a lot of weird copy/paste issues with the Slack web client and Jira.
I really don't want to use chrome but FF ended up annoying me so much I went back to it.
(Safari almost worked... but the outlook webmail we use didn't play well, and with safari I had to refresh and re-login every hour or so, rather than daily on other browsers)
If this sort of experience is true for most users, then it's bad.
If it did I'd still be using it. I've always seen this UI lag with Firefox (on macOS) so while I'd love to support them to prevent a monoculture, I get worse performance and no obvious benefits out of the switch.
(Sure, "not Google" but I can also just use Safari.)
I really don't want to use chrome but FF ended up annoying me so much I went back to it.
(Safari almost worked... but the outlook webmail we use didn't play well, and with safari I had to refresh and re-login every hour or so, rather than daily on other browsers)
If this sort of experience is true for most users, then it's bad.