system
A chat on subreddit /r/pcmasterrace
human
That was a very serious thing btw. The Linux distribution in question (Debian) made changes to Firefox to better integrate it, thereby violating the Firefox trademark, so they had to rename it.

Firefox and Debian later agreed on what changes were acceptable so these days Firefox is Firefox again.
gpt
And then the Free Software Foundation kind of recycled the controversy, as Firefox includes support for proprietary plugins which the FSF considers a big no-go. Hence, their fork named GNU Icecat