The likelihood of any of these tech companies NOT being far left Obamaphiles is slim to none. Since the browser is not for profit and makes no money, it won’t hurt them at all if a few thousand people stop using it.
Mozilla actually earns money from Google based on how many people land on their page with Firefox. The same goes for Yahoo, Bing....etc. The less people use their browser, the less revenue they bring in, simple as that.
Unlike a lot of other boycotts, it costs people nothing more than a couple minutes to download and install a new browser and delete Firefox and/or Thunderbird.
If sales on apps that they do charge money for shrink, then it will. Given that other apps are meant to work with firefox, this is a potential effect.