On your Facebook feed or timeline 'Right Click' on any video then 'Copy link address'. See screenshot below.
Go to GetFb.Net. Then paste the URL and Click 'Download', like the screenshot below
Click on "Download Video Normal Quality" or "Download Video In HD Quality" (if available) to start downloading the video.
Note 1: If the video starts playing instead of downloading, then on Step 3 Right Click the link and "Save as..." to download the video.
Open the Facebook app and Tap Share on any video on your feed or timeline, then Tap Copy Link.
Go to GetFb.Net, and Paste the Video Link before tapping Download.
Tap and Hold on any video format available (HD or SD). Then Tap Download Link and confirm the download.
Note 1: You can find your downloaded videos under the 'Downloads' section in Web Browser menu.