All that the (entirely voluntary) extension does is light-heartedly change one word from something clearly derogatory ("bitch!") to something affirming ("boss!") Tee hee.
It's a funny novelty toy.
https://blog.mozilla.org/firefox/firefox-b-tch-to-boss-exten...
The article is trying to create drama where there isn't any.
Instead of falling prey to outrage when Firefox can't live up to our impossible standards, how about we appreciate and celebrate even small accomplishments?
It's precisely the reason why those projects are so important. Not that we should tolerate anything, but the alternative is a shady ad-tech monster and various questionable projects like Brave