Mozilla Firefox browser which is developed by Mozilla Foundation faced criticism by Debian Developers because of its official trademark policy is seen by them as excessively prohibitive.
This have still being debated in the Debian Community.
Most of the concerns came around whether Mozilla’s trademark policy allows them to modify the software for updates and security patches, and still distribute it using its original name. There are a lot of other projects too that recompile Mozilla Foundation source code and make additional changes and still release the resulting binary with Mozilla’s trademark.
Although Mozilla Foundation however, have given Debian explicit permission to use the Firefox logo and brand name, the issue still rise because it contradict with the clause of the social contract which stipulates software licenses must not be specific to Debian.
Mozilla previously have several problems with trademark issues regarding it’s Firefox browser which was change from Phoenix to Firebird and finally to Firefox.