That's not what he did. He donated for California's Prop 8, which opposed same-sex marriage, in 2008. I'm personally not judging, as many US progressives have forgotten that during those days, even Obama opposed same-sex marriage. But it's important to get the facts straight, even when being sarcastic.
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> Then they spent their time politicking and not enough coding.
Mozilla's management certainly is guilty of blunders, but I'm pretty sure the developers who have worked on Mozilla don't feel like they've spent time “politicking”.
The failure of Firefox in the marketplace starts from the fact that it's pretty hard to compete with a browser that's funded with more than 1 billion $ per year. And people may not remember much about the launch of Chrome, but it was literally years ahead of its competition. Have a look at its famous comic book, with which it was announced, describing its design and philosophy, and count the years it took for the competition to catch up (across the board, including Safari): https://www.google.com/googlebooks/chrome/
I mean, sure, you can blame that on politics, but I don't think anyone was able to stop the decline and when Brendan Eich resigned, people were already talking about Chrome's hegemony and Firefox dying.