Firefox
Firefox is free software ?
It is... but it recommends non-free addons an plugins (including to play DRM with Adobe's blob). Changing that means changing the name and logo of the Web browser. Indeed, Mozilla's trademark policy imposes that, what is reasonable (trademarks aim to help the consumer identify the product). What is not reasonable in Mozilla's trademark policy is that commercial exact redistribution of Firefox requires either Mozilla's written permission or to change its name and its logo.