This add-on is useless and confusing. When I tried to use it, it asked me to submit a URL address. It opened a new tab and gave me the following message "You have to setup a suitable URL for your favorite downloader service. You can use the variable {url} to forward the currently viewed video URL to the downloader service." I don't understand this message and can't understand how this could be a reasonable way of setting up a download service. Nor do I have an URL address to submit to them. What does this mean? There is no explanation, nor supporting page or introduction. I've decided to delete the add-on even though FF recommended it. I'm assuming they made a mistake.