Now you're putting words in people's mouths :) FF has been involved with politics on way more than that. I don't know about the OP but you don't have to be a Trumpist to be put off by FF's campaigns.
They are essentially preaching 'privacy' to those wanting to a privacy-focused browser and product and having that as its main unique selling point but then is paid by an anti-privacy company 'Google' which contradicts everything in Mozilla's mission statement.
Plus, Mozilla sort of did this to themselves anyway and turned Google into a direct competitor with Chrome.