No, it was a trademark issue, raised by Mozilla (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=354622) and seemingly resolved on their (Mozilla's) end (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=815006). For what it's worth, the recent Rust trademark issue seems to be of a similar vein (and the justifications around the Firefox sound like those used in Rust).

Can you provide any evidence that the User Agent name was a trademark issue. As in the name exposed to websites. Because that is the only thing that matters here and also where everyone claims to be a variant of Mozilla for compatibility.

Thanks for clarifying!