It downloads alright, though it does it at some slower speed. So it interferes with the possible downloadspeed somehow.

Secondly, much worse, aggregating sound and the movie (combining of the video file and sound file) takes forever. For a five-and-a-half minute video at 720p it took the plug-in just over 30 minutes! I'm on a I7 3820 @4.1 GHz. FFMPEG is at a 10% CPU load. Such a long aggregation time for this size of a video is not normal.

Thirdly, it didn't finish a few aggregation tasks, I wonder if the browser has to stay open for the duration. Also, imagine if it is a huge file. It would take forever to aggregate.

Setting the download folder fails. Something is wrong with the interface. Sometimes the settings interface closes by itself! What the heck LOL? Clicking on a custom download-folder sometimes works - so it seems - but checking it twice, your option has been deselected again. The settings page needs work.

Finally, the location of the downloaded sound-file (which needs to be combined with the video) isn't known to me yet. It's somewhere. I'd rather like to see everything downloaded in one folder, including files which are just intermediary steps.

All and all, this add-on has so much potential - it also downloads 1080p videos, but the aggregation-time is killing me.

Edit: ARE YOU EFFING KIDDING ME? Now I know why it takes this long to aggregate.
It adds a massive QR code in the top left corner of the video!!!

Also... the video was downloaded in 720p, but the remaining result is is also in 720p... with a bitrate of only 436 kb/s! In other words it looks like a bloody 320p video now, despite the high resolution.

Needless to say I'll uninstall this absolute rubbish in a minute.