- He donated to Prop 8.
- He donated to Pat Buchanan, who has largely made his bones on hating anybody who isn't WASPy[1].
- He donated $750 to Thomas McClintock[2], another politician who makes a show of being anti-gay. Eich was living in Santa Clara--not in McClintock's district.
- He donated $500 to Linda Smith[2], she of the "morally unfit inclination" opinion of gay people. She was running in Washington, while he lived in California.
The reason I list these is to dispel the notion that it's "one event". He has a pattern of going out of his way (out-of-district donations) to give money to causes and politicians who are particularly strident in their anti-gay stances (and even Ron Paul, who he also gave money to, is notably anti-gay-marriage and remains static in that despite having vacillated on marriage privatization).
This is, by my lights, who he wants to be known to be. Should that not be considered in the light of Mozilla's self-described values? (I do not believe there exists a coherent, moral worldview where it's not important to prioritize the inclusion of the less privileged ahead of the comfort of the privileged. I say this while thinking of multiple communities of which I am a part that sometimes make me uncomfortable in the effort to make those less privileged feel respected and safe. The actions that result in this piss me off sometimes, but I am an adult and I recognize that it's for the net benefit of everybody.)
[1] - http://www.theguardian.com/technology/2014/apr/02/controvers...
[2] - OpenSecrets donor query - it requires a captcha, though, so I've omitted the link.