To download a youtube video from firefox it says that you need to install a piece of software, I did so after checking it was valid, what it does not tell you is that the videos that are downloaded are imprinted with a huge watermark that makes them unwatchable, then it says that to avoid this you need to pay us almost £20. I do not mind adding paid features but to make someone download the addon, download the software and install it, go through a long download then finally to tell you about the paywall and watermark AFTER you have done all of this, it is just a huge waste of time. Will be uninstalling and would not recommend as it is a borderline scam.