How to Download Facebook Private VideosStep 1
Go to the video you want to downloadStep 2
One can get the page source by right clicking on the video page and choosing the option "View Page Source".
Press "CTRL + U" OR Right Click > View Page Source
Now, Copied page source in the box provided. Once done, click the “Download” button provided.
Press CTRL + A to select all, Press CTRL + C to copy all (HTML page)
Go to this page Private Facebook Video Downloader
Paste the copied source, then click Download