> when Firefox does things to push away users like Mozilla buying up an ad-tech company
What would you have them do? Somehow they have to make some money somehow.
Alternatively they have to live purely from donations, which means that people like you and I have to part with of our money. Or they could be purely open source, in which case people like and I donate our time.
It's not an either/or situation. For many years now people have been begging Mozilla to allow them to give money to help fund firefox (and only firefox) but Mozilla has refused. I can't promise that allowing it would provide all the funds they need, but certainly every little bit helps. People could continue to contribute code to the project, but that requires a lot more time, effort, and no small amount of skill compared to the time it takes to enter your credit card number and submit and an online form. Contributing code to Firefox is still a good thing, but it's a process (https://firefox-source-docs.mozilla.org/contributing/contrib...) that won't be for everyone.
How is it that we can have a plethora of different Linux distributions, the Linux kernel, the FreeBSD kernel, the OpenBSD kernel, GIMP, LibreOffice and several other large projects that are run and maintained by donations and volunteers.
Yet somehow Firefox is different? It needs to make money! It needs to make money so much that they keep spinning up all sorts of new projects so that they can make more money, or at least that was the argument for some of what they were doing.
At this point in time, if they had taken all the money they spent on their various projects and put it in a trust they would probably be able to fund development without taking in any more money.
And it's not like people wouldn't donate to them either, look at how much Wikipedia has pulled in from donations.