What do you mean? Mozilla doesn’t collect any data for Google; AFAIK Google supports them to avoid antitrust and does not dictate what they do. As you said, Mozilla is the only hope of free independent web and using Firefox helps to show everyone that it should be supported by the websites. DDG browser has a negligible usage and no one would even notice it in the statistics.
If you mean that Google is the search engine then it’s not a huge loss in my view, since most people got used to Google anyway and would complain if the search engine was different. I change it in a couple of clicks and never even think about it.
Happy user of Firefox since a long time.
As @amosbatto said:
I don’t see any evidence that the organization actually pressured or encouraged Eich to resign, and he clearly was not fired. (quote from lwn.net)
See also my earlier post on the topic: