I've found today after going to MacOS27 (I skipped 26 fully) that Chrome extensions don't load properly. They're super, super slow. I've found one or two other bug reports of this from older Dev builds but that's it. Bizarre. Time to flip back to Safari I suppose.

Ironically in macOS 27 I've had a bunch of issues with Safari extensions. 50% of the time they don't load on their whitelisted domains. Click on their toolbar icon and they pop in.