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YouTube Persistent Video Container Background 1.0.1-signed.1-signed Requires Restart
Gives the Youtube Video Container a persistent background across videos and removes any image that Youtube adds on either/left side of the video. Static background colour is currently black.
This add-on has been marked as experimental by its developers
This add-on is not compatible with your version of Firefox because of the following:
About this Add-on
Most of the code used to build this plugin was borrowed from here.