@-moz-document url-prefix(http://www.youtube.com/watch)
{
    /* Hides bulk of stuff:
    - favourite/share/palylists/flag/facebook/etc links
    - footer
    - copyright
    - comments
    - embed/link codes
    */
    #watch-main-area,
    #footer,
    #copyright,
    #watch-comment-panel,
    #watch-url-div,
    #watch-embed-div,
    #watch-stats-data-wrapper,
    #watch-video-responses-none
    {
        display:none !important;
    }
    
    /* Hide video responses */
    #watch-this-vid-info div.expand-panel{
        display:none !important;
    }
    
    /* Hide featured/promoted videos */
    #watch-promoted-videos-container, 
    #watch-featured-videos-panel,
    #watch-channel-brand-div{
        display:none !important;
    }
    span.expand-header{
        display:none !important;
    }
    
    /* Hide logo */
    #masthead-inner > button.master-sprite{
        display: none !important;
    }
}