Bait and Switch
I have never reviewed a Add-On before. I have enjoyed a lot of great ones, suffered some lame ones but this is a bait and switch scam and I am frankly shocked that Mozilla would permit it on their site. Nowhere in the description does it warn that:
A. It requires you to install a downloaded .EXE, from somewhere other than Mozilla, that gets flagged by Microsoft Defender as: “This program has potentially unwanted behavior.”
B. It puts a big QR code watermark on your video unless you pay $28 for the licensed version.
If you read the other one star reviews you will get the same story, the truth. It does work, albeit slowly, and does have memory leaks.
They even got tossed off PayPal so you have to use your credit card. Nah.

Easy to use it can download videos in facebook and almost every other sites. Also, it can download private FB videos and Live Videos. Works fine all you have to do is click the icon and the recommended download size by the app

very nice!

does what is says on the tin, nice work!

Doesn't work, at all.

it is the best downloader add on in the world

works fine all you have to do is click the icon and the recommended download size by the app. *****

Pas de version originale ou bien pas de son du tout. Aucun intérêt. Download helper était très efficace, ce n'est plus le cas. A désinstaller sans regret.

En muchos sitios NO funciona.

Works excellently and is fast compared to other add-ons

Work well after one day of regular use. Provides access in sites Video Download Helper doesn't.

Una muy grata sorpresa, la extensión ¡Es muy útil! Me da muy buenos resultados, en la mayoría de las páginas reconoce los videos y me permite descargarlos. Recomiendo que la descarguen y la usen.