[vehemenz]

You're not the only one. Firefox uses way too much GPU power on MBPs. Supposedly fixes are in the works, but I doubt they will happen any time soon. I've learned to tune out the 'improvements to performance' claimed by Firefox releases because never actually do anything for MBP users.

Like you, it is one of the main things keeping me to Chrome (although pinch-to-zoom and casting are nice, too).

My solution for Chrome's privacy issues are similar to yours, except I use the full sync for bookmarks, but then I switch to a private window for actually using any Google site (except for search). At the end of the day, it's still a huge compromise. I might try going full Chromium for a while and trying your bookmarks method, although plugins are a bit of a PITA.

[j7k6]

The only reason I'm not using Chromium is that 1Password is not trusting it as a "secure browser".

[auslander]

1Password is closed source app. KeepassXC is better, and Keychain for syncing.

[DavideNL]

then use Brave... (un-Googled and you can use Chrome extensions.)

https://brave.com/download/