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how to use installed add-ons?

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I have downloaded flash video downloader add-on, but when I open YouTube,I just don't get how download video using the add-on..please help

I have downloaded flash video downloader add-on, but when I open YouTube,I just don't get how download video using the add-on..please help

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Move your mouse to the top of the Firefox window, then right click. You will see a menu of the available toolbars. Select Customize. In the new window, look for the icon. When you find if, hold down the left button on it, and move it to where you want it to be. You can move any of the icons you want from here, but some icons are locked in place.