I agree with the implication of the title. The article is also anti-Trump, though anti-Trump != anti-right.

Although Mozilla does take an ideological position on some issues, I have not yet seen any mechanisms within the browser that favor one side of the partisan divide, intentionally or practically. I can't say it'll never happen, but Mozilla has been even-handed so far, and I'm sure there's not a lot of appetite to piss off any large contingents.