Access facebook by computer. Find the video to download, click on the time of posting

Press Ctrl+U (Windows) or ⌘-Option-U (Mac). to view page source OR There do right click on any section of the page, then click on the option "View page source"

Highlight all text by pressing Ctrl + A (Windows) or ⌘ + A (Mac), then right click and choose Copy

Go to and paste the copied source code into the input box.

Select the video's quality that you want to download

Download Facebook videos to your device.