According to TF1 he was arrested due to lack of cooperation with law enforcement regarding suspected complicity in drug trafficking, CSAM, and fraud. So my interpretation is that they repeatedly ignored french law enforcement asking Telegram to take down certain channels. Maybe warrant was the wrong word I am not a native speaker.
It is not really FUD to point out that Mozilla wastes ungodly amounts of money on projects of dubious utility instead of investing it into their browser. Their current trajectory doesn’t inspire much confidence either. Mozilla started to waste even more money on ‘AI’ features nobody asked for.