There's something that doesn't click in the article, they say:

the issue at stake about that proposition was declaring a marriage to be an union of one man and one woman

But just before that they link to the Wikipedia article:

support for the Proposition 8

Which states:

Proposition 8 [...] was a California ballot proposition and a state constitutional amendment intended to ban same-sex marriage

So I fail to understand how this:

Even couple of LBGT employees of Mozilla Corp. defended Brendan Eich on their blogs claiming that there is no discrimination against them in Mozilla

Could be possible, I tried searching for their blog post, since the author didn't link it anywhere, but not knowing who they are I wasn't able to find anything. It could be true, but still, Mozilla isn't the whole California, if they are treated well due to company culture good for them, but that isn't an excuse to let gay people be discriminated outside of Mozilla

It seems to me like what everyone thinks is right, even if the proposition were made to "declare marriage a union of man and woman" it would just be a roundabout way to say "declare union between man and man/woman and woman not marriage" so... ban same-sex marriage?