[Kristine1975]

Brendan Eich stepping down as Mozilla's CEO was not due to speech:

>His appointment sparked controversy over a $1,000 political donation Eich had made in 2008 to the successful campaign for California Proposition 8, which sought to establish that, "Only marriage between a man and a woman is valid or recognized in California."

[amdavidson]

While I don't agree with his personal donation or Citizen's United, that case held that political donation is a form of protected speech[0].

So in a very literal way, he was pushed out due to the manner in which he chose to speak.

0: http://www.scotusblog.com/case-files/cases/citizens-united-v...

[comex]

You don't have to support the Citizens United decision to think that contributing small amounts to political campaigns is effectively speech - because the money is used to promulgate speech (ads), as well as in the more abstract sense that donations are viewed by society as a normal and encouraged outlet for people to promote their viewpoints.

(Of course the humongous donations the decision enabled are also used to promulgate speech, which is why I have some sympathy for it, but there's just a huge difference in practice between giving $1,000 and giving millions.)