A user looking for the Firefox browser on a Debian system may come away confused; seemingly, that program is not shipped by Debian. In truth, the desired software is there; it just goes under the name "iceweasel." This confusing naming is a result of the often controversial intersection of free software and trademarks. Critics claim that trademarks can remove some of the freedoms that should come with free software, while proponents assert that trademarks are needed to protect users from scam artists and worse. A look at the activity around free office suites tends to support the latter group — but it also shows the limits of what trademarks can accomplish.
https://lwn.net/Articles/536126/