1. Install the extension.
2. Visit any page of FB that contains any videos.
3. A button in green color will be shown on right top of the video.
4. Click the button, choose video quality in the popup window and click ‘download’.
6. Right click above the video player and choose ‘Save as’.
This tool is an independent project and has no relationship to facebook. It will neither upload or store your video, nor keep your visit records.