Because people want to see them spend their efforts on holding the Internet back from a WebKit monoculture, and donate to that cause, but they keep wasting resources on political activism, pointless bs like time-limited themes, etc. while downsizing their engineering team. Not doing those isn’t “impossible”, in fact they go out of their way to disappoint people with those distractions.
Yes, I’m aware of that. People would like to donate specifically to Firefox development though, and some donate to Mozilla Foundation under the impression that it would help. I’ve certainly done that in the past.