When people oppose "Politics" they usually mean politics they don't agree with. The politics they do agree with aren't "politics" to them, that's just a normal part of everyday life and it's crazy that other people try to claim that's "politics".
If you have a broader understanding of what politics is in the first place you're not going to object to an organisation having "politics" because of course it does, it's composed of people, it exists to further somebody's goals or else it wouldn't exist, it's not like organisations can spontaneously wish themselves into existence.
My understanding to people opposing politics in certain things, is typically about opposing unrelated political messaging in said thing.
For a free open source web browser, obviously there is will be politics somewhere. FOSS is political in nature. Web standards involve politics, with multiple parties wanting to influence them for their own reasons. Hell, challenging a multi-billion corporation monopoly is inherently political.
Having political messaging about "celebrating voices making the world a better place" is odd and misplaced political messaging, orthogonal to the politics of a free open source web browser, and will alienate part of the people that are not interested in something this unrelated, irrespective to their agreement to said messaging.
I am personally in favor of universal health care. I wouldn't like to see messaging about it in a web browser, just to give a silly example.
A browser could theoretically be politically engaged by ensuring open web standards and accessibility etc. but this is not that, me thinks.