Installed it in Google Chrome, tried downloading a video.

First it didn't work.

Then I tried changing "http" to "https" in the address field of the browser (the Facebook address of the video) and load the page again with the new address. Then I got the two download links ("Download High Quality and "Download Low Quality").

When I clicked the links, the video just showed in Chrome.

I had to right click the download link and select "Save link as" (or something like that, my Chrome speaks Danish). And then it worked - the video downloaded fine as an mp4 file and it was playable.

Im gonna go ahead and say it dosent work...and then sometimes it does...