I wrote back, politely explaining the principles of copyleft – that the software was free, both as in speech and as in price, and that people copying and redistributing it was a feature, not a bug. I said that selling verbatim copies of Firefox on physical media was absolutely fine with us, and we would like her to return any confiscated CDs...
Her reply was incredulous:
"I can't believe that your company would allow people to make money from something that you allow people to have free access to. Is this really the case?" she asked.
"If Mozilla permit the sale of copied versions of its software, it makes it virtually impossible for us, from a practical point of view, to enforce UK anti-piracy legislation, as it is difficult for us to give general advice to businesses over what is/is not permitted."