The extension started having problems with downloading videos recently: speed is slower, and pretty often the video is not downloaded completely. If I have to guess, it's because now it applies a QR code wartermark to downloaded videos, so the author focused on DRM rather than on stability and functionality.

I also love that not only the extension now aggressively DEMANDS money to work, but even in case if you pay it limits the period of working to one year. Therefore using the worst licensing practices known to humanity.