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About this Add-on
By installing this extension you will get an stop button on the right side of the play button. Pressing this button unloads the YouTube player and hence it will stop buffering videos.
Note: This extension only works with HTML5 players. No button will be appended to the Flash version of the YouTube player.
For other YouTube related tools please check my page at http://add0n.com/youtube-tools.html?from=stop-button
Please note that the FAQs page of this extension contains Google Analytics; Terms can be found https://www.google.com/analytics/terms/us.html
2. Using a unified player unload listener to have better compatibility with my other YouTube tools
This add-on is not compatible with your version of Firefox because of the following: