you're just replacing Mozilla telemetry with Google telemetry.
Mozilla to-date refuses to build a one button switch to disable all telemetry [0] and there's calls to telemetry domains such as location.services.mozilla.com you cannot stop on some of their products like Firefox Focus (ironic for a privacy product).
[0] https://support.mozilla.org/en-US/kb/domains-allow-firefox
https://www.ghacks.net/2022/03/17/each-firefox-download-has-...
I like uBO but you can replace it with a dns filtering service for 95% of its use case (ad blocking).
It could just be me but I do not see browser extensions on mobile as a killer feature. Moreso, when the same extensions are primarily developed for desktop.
This entire thread has omitted discussion of either.