Lors de l'utilisation de Firefox, Avast! m'indique : Menace éliminée : Nous avons annulé la connexion Jackyhillty.net car cet élément était infecté par other:Malware-gen [Trj].

Après élimination, il s'avère que c'est cette extension qui est à l'origine de ce malware.
En effet, une fois désactivé, l'avertissement de ce malware ne s'affiche plus.

BEWARE: MALWARE OBSERVED BY AVAST!

can not found stream video

downloading teaching video

垃圾，检测视频太慢，而且名称区分不清楚。 @XVideos

gracias por hacerme perder mi tiempo

GRANDE MERDA

For years, this add-on has required an additional program to installed. No problem. But the program has never installed. Not once. Not for several years. This add-on does not work, has not worked and probably never will work.

It does not work on the only website that I am interested into: archive.org.
Anyway I would never install it in my main browser, because it can see all my passwords and other things that I write.

See:

https://support.mozilla.org/en-US/kb/permission-request-messages-firefox-extensions#w_access-your-data-for-all-websites

"The extension can read the content of any web page you visit as well as data you enter into those web pages, such as usernames and passwords."

When this Firefox add-on works, it's great. Some sites are designed to defeat it, so it doesn't work everywhere.

But today I went to go to Youtube, and I found I was instead routed to "gositedeal" and then to "ww-youtube.com". This add-on shouldn't have been doing anything at all at that point in time. Extremely sketchy. I'd rather shop around for a different video capture add-on than expose myself to whatever kind of malware FVD is trying to expose me to.

Ruft ungewollt ww-youtube.com auf bzw. leitet darauf um.
Malware.

This copied report says it all:

This add-on recently started redirecting users with malware-like behavior to ww-youtube.com when visiting youtube.com

All it gives is a set of webm files (all named "videoplayback") of various sizes with no video download options, and no viewable video being saved.