I know this kind of goes against my other comment stating that I'm super worried about losing the only viable free and open browser out there (my only browser), but: what's keeping me from donating is the bad aftertaste of the money being used for frivilous things. I don't want to fund their bookmarking service. I don't want to fund their VPN rebranding effort. I don't want to fund their authentication services. I don't want to fund their voice recognition services. They're probably great, but it's the browser that's absolutely essential and irreplaceable at this time!
Otherwise, this would be like your employer saying, "I will pay you salary, buuut only if you promise not to spend it on alcohol". It clearly doesn't work like that, you just have to make a high level judgement if you agree with their values and if yes, go ahead with that donation.