Be careful when using this tool, it injects a redirection to out going links. Why would they do that! Not a safe thing to do. Who knows what other things are injected or hijacked.

Doesn't work on Youtube. Can't see anything on the page, no video files. A useless addition.

Don't work on all websites.

This add-on still works with Dailymotion, but not YouTube.

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doesn't work on most site

Adware. It replaces some links you click with third party referrer sma***edirect.de

video was about 20 minutes long but this app see only files smaller then 1 MB

Tested on 02/05/2021.
No download button on youtube.com!! So I can only assume that this FF addon is another scam to get your browser data!!

Contains adware

Since there aren't any links to contact the developer anymore, I guess I'll ask here. Will you please explain the purposes of the particular permissions this addon requires? Why do you need to access my data for all websites? Etc.

Doesn't see any videos on Youtube and Facebook

This extension ("Flash and Video Download") injects smartredirect links into regular browsing processes that have nothing to do with the supposed functionality of the extension, so instead of directly going to another page or site, it loads a smartdirect catcher link in-between.
This behaviour should be banned.