Gonna play devil’s advocate here… I think most Mozilla money comes from Google and i think the reason Google keeps the money flowing to Mozilla is for Chrome to have a real competitor, Firefox to date is the only popular web browser with different engine and all that. Maybe it’s fair for me to say that it resembles a tiny tiny fraction of why Intel keeps AMD alive back then.
As for EFF, i viewed them as just another NGO. For me most NGOs will have a non achievable goals, because it will be the dead of an NGO if they ever achive their goals. (No more money for them).
I’m not against people donating to Mozilla or EFF or Thunderbird Foundation. I think it will be better (yet longer process) if government can regulate big tech, much like what the European Union did with GDPR.