I tried Facebook Videos Downloader, but it keeps saying that it's a private video and that I need to install the browser extension. Not sure what they mean, the contact link isn't working.

As a possible workaround you can try to use the Inspector to get the URL of the video and open the video in a new tab and save the video from that page.

You can right-click and select "Inspect Element" to open the builtin Inspector with this element selected.

• https://developer.mozilla.org/en-US/Tools/Page_Inspector/How_to/Examine_and_edit_HTML

You may have to search for 'video' to find possible embedded videos.