Welcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.Close
About this Add-on
It is possible without a restart On / Off, it is recommended that you disable in order to eliminate the performance degradation if there no use.
sites that are frequent specification changes, such as youtube does not correspond
※ Because there may not detect the URL of the video in the buffer already, please try to reload the page in such a case.