There is an extension that makes it very easy to download videos from Facebook. This one seems to be only available for Chrome-based browsers. Before you can use it in Opera, you need to install an extension called Install Chrome Extensions.
In Opera, go here: https://addons.opera.com/en/extensions/details/install-chrome-extensions/
With Opera, you have to jump through a few more hoops when you install extensions from “unknown sources”. You’ll get a message telling you to go to the extension manager to confirm. You should get a similar message across the top of the browser with a button labeled Go to Extensions.
In the extension manager, click on Install then Yes, install.
Then you should get a confirmation message.
Now go here to install the extension called Video Downloader For Facebook:
You’ll have to jump through the same hoops in Opera. For Chrome, Vivaldi, and Brave just click on the add to button and accept any prompts.
Once the extension is installed, find a video on Facebook and you should see a blue Download button. Move the mouse over the video. If you don’t see the download button, just click on it, name and save it.
Anybody got a good add-on to download Facebook videos in Firefox? Do us a favour and list it in the comments.