In order to uninstall a possibly unwanted extension, please do the following: From the Firefox window click the Firefox button at the top left and select Add-ons, or, if the Firefox button is not shown, click the Tools menu and click Add-ons.; Once the Add-on Manager has opened in a new tab, click the Extensions button on the left side of the window. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

well i recently downloaded this one add on called 1 Click YouTube Download. and it worked perfectly fine for about a month or so, and i tried downloading another video yesterday and just now and it won't work. on the downloads pop up box it just says 0bytes and its like this for every video! i tried flv, mp4, 3GP and i even tried to use another add-on called Easy YouTube Download and that doesnt work either! it just tells me to save and then goes to the download pop up box and then it says completed with 0bytes.

This happened

Every time Firefox opened

Mozilla Firefox Youtube Downloader For Windows 7

yesterday