Some Linux distros, such as PureOS, ship Firefox with the official branding. Others ship a debranded fork of Firefox, such as Trisquel's Abrowser. PureOS and Trisquel are both FSF-approved Linux distros that only ship 100% Free Software.
I assume the debranding itself isn't required for Firefox to be Free Software since PureOS gets away with not doing it. I also assume that distros like Trisquel aren't debranding it just for fun.
Why is there this discrepancy?
- Is there some difference in policy between the distros that still requires it in some but not others, and if so, what exactly?
- Or something else entirely?