Discrimination still exists, even for things some think are solved(e.g. race, gender). Often change doesn't occur unless some are forced to change, even while gritting their teeth.

CEOs are public figures, and if the public doesn't like what they stand for, they can certain;y ask the organization to make a change. Mozilla stood for openness and freedom, which is counter to the actions of the CEO. It's not intolerant to tell a company that their CEO is engaging in activity counter to the message of the organization, and ask for their removal.