The audience of HN is unlikely to make a difference here.
Besides, we are not some political party who all need to vote in one way together. Each person individually here makes their own choices.
Personally I think making my life harder with pointless sacrifices is not useful. I ask myself, am I making this sacrifice to make myself feel good, or because I actually think it can make a change? In this case, I don't think it would make any difference and it wouldn't make me feel good so there's no utility in using Firefox, for me.
This subject - browser monopoly, and related things like OS or app store monopoly - needs to be tackled with regulation, not personal sacrifices.