Works OK, dont know why the dev doesnt give proper instructions. There is a button UNDERNEATH timeline FB posts (but not in 'saved'). Click this button and you are taken to their web site, click download and FF download dialog opens.
Toolbar button opens their web page, you paste the URL, click "HD", it opens a new tab which plays the vid. No downloaded file. Would help if they made it clear you can SAVE THE NEW TAB (it's the extracted mp4 file).
Quality seems about the same quality you see playing it on FB, no info about the quality of vids available

good stuff.

As far as I can tell it's not working. There is no way to select a destination folder and the videos are not going into my download folder. It's useless if I can't find the videos so I don't know if they even downloaded or not.

As others have said, this add-on is just a bookmark to the developer's page. if you try to do anything with this extension that other extensions can't do, like download private videos—which is its main selling point—it just tells you to paste the link into the website. every time you open a new session it pops up the website, which is annoying enough to make me uninstall and just bookmark the website. the website itself does what it says it does, but the extension adds no functionality of value.

download quality button does not appear and toolbar button simply brings you back to the site that told you to get the extension. Useless.

It promises to download private videos, but it is merely a bookmark that harvests your browsing history and merely takes you to the online form to download the video, which when it fails tells you that you can use the addon to download "any" video including private. Circular failure.

ES mu bueno

All it does is open up the website. It is nothing more than a link to the website. You can simply bookmark and open the website to paste the link to download the video. This add-on has no additional benefits.

FAKE!!!