Examples that I could find. Not sure that the browser itself is a political tool (yet). But the leadership has been strongly in favour of implementing some dystopic ideas. Crazy ultra far left weirdos.

"MOZILLA CEO CALLS FOR INCREASED CENSORSHIP: ‘WE NEED MORE THAN DEPLATFORMING’"

https://www.movieguide.org/news-articles/mozilla-ceo-calls-f...

"Notes on Implementing Vaccine Passports"

https://blog.mozilla.org/en/mozilla/leadership/notes-on-impl...

And the usual corporate social justice / diversity bullshit:

https://blog.mozilla.org/en/mozilla/leadership/mozilla-racia...

https://www.mozilla.org/en-US/careers/diversity/