Install a browser extension like (Chrome/Firefox). Log into Facebook.
Facebook’s Terms of Service explicitly prohibit the collection of user data or content without permission. Using automated scripts to scrape or download content can result in: script download facebook video
Here are a few frequently asked questions about script-based Facebook video downloading: Install a browser extension like (Chrome/Firefox)
There are a number of scripting languages you can use to download Facebook videos, including: script download facebook video