Don't pretend like you're patronizing them. You're using a free browser. There's nothing they've done or can do to affect your experience within the browser, and it still remains an open browser. There's no moral hangups here beyond the ones you imagine for yourself.

That post sounds quite skeptical of the way the deplatforming was handled, and the power of sites to arbitrarily deplatform. Can you be more specific about your actual objection?

The title of the article is bad, but the actual suggestions for action against extremism are quite good.

We do need research to fix social media, and we do need transparency.

Firefox is generally good; they have some identity politics, but it hasn't taken over their ethos.