All of a sudden when I open Firefox it starts playing a video on youtube

Previously, when I opened Firefox I had the normal home page. Now I have the normal home page but I can hear a youtube video starts playing in the background, and when I click on the tab I see that a movie began to play automatically. The movies are related to a topic, earlier I searched on Youtube, but it is not always the same, so, probably, I clicked on something I should not have done. I followed the suggestions of the internet on the home page reset and they did not work. Basically, I can now hear the sound from any video / movie to youtube I chose to play because of the noise from the other, unwanted, one in the background.

Help! What should I do to resolve this issue and stop these videos?

With our thanks, Kathryn

Hello! This must be crazy you! Maybe you've already tried this, but just in case where:
Type in the address bar about: config (promise to be very vigilant) Type and are looking for: media.autoplay.enabled it of set to "true", change it to false

Tags: Firefox

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