I "let people be" when their religion doesn't harm them or other people.
And I don't care if "not all Muslims think of women that way". Their decisions/opinions make them better people, they don't make Islam a better religion.
This is, of course, not limited to Islam.
Firefox implements everything the various web standards require. There are a few non standard features that Chromium implements that certain websites take advantage of, but the fact that their code isn't portable is not Firefox's fault. As for Teams... Microsoft's just being a dick: if you change the user agent it works just fine.