What about a relatively small donation to the KKK or a neo-Nazi party? The issue isn't the size of the donation but taking a public stance in support of bigotry.
President Barack Obama once believed marriage only was for one man and one woman.
Was Obama once a supporter of the KKK? Do you people seriously not realize that gay "marriage" has been concocted into a moral imperative only very recently by the media? And that just a few years ago, not only was opposing it not bigotry, but being in support of it was completely loony tunes?
Snark aside, this analogy will work when Brendan Eich changes his mind as Obama did. No one is saying he's forever doomed by his position in 2008, but if he still believes it people still have every right to disagree with him as vocally as they want.
I agree that this change has been unusually swift compared with, say, the shift on interracial marriage from "loony tunes" to unremarkable. But I think that's mainly because there isn't a ton of gay/straight segregation, not like racial segregation. Now that being in the closet isn't nearly as common, it's hard for people to take an abstract anti-gay position without facing the fact that it will hurt somebody's family member.
But the legitimate question for any Mozilla employee or partner is: will I face discrimination from Mozilla's new CEO? Sure, Eich has promised to behave at work, but he hasn't apologized, and hasn't done anything to demonstrate that his opinions have changed.
Personally, Eich's weird avoidance of the topic makes me question his fitness to lead a major non-profit. His handling of this in the media has been less than adroit. CEO is a public-facing role, and so far he doesn't seem to be very good at it.
That's a legitimate question, absolutely. The openly gay people who have been working with him over the last several years at Mozilla seem to be saying they haven't faced any discrimination from him in the process. And Mitchell, who has worked with him very closely since 1997 or so, was very surprised when she found out two years ago about the 2008 donation [1]. Which implies that he had kept any thoughts he had on the matter out of his closest professional interactions for those 15 or so years. Make of all that what you will.
[1] https://blog.lizardwrangler.com/2014/03/26/building-a-global... next to last paragraph.