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).