Steps to reproduce: 1 - Open a video or a page with a video embedded 2 - Click on the play button 3 - Right click on the video and click on Show Statistics 4 - Will throw exception Test Page - http://diogogmt.github.com/mozilla-central/gizmo.webm **this bug only happens in a slow network connection DUMP: videoctl: Got media event ----> play videoctl: Status overlay: seeking=false error=null readyState=0 paused=false ended=false networkState=2 timeUpdateCount=0 --> SHOW videoctl: Got media event ----> waiting videoctl: Status overlay: seeking=false error=null readyState=0 paused=false ended=false networkState=2 timeUpdateCount=0 --> SHOW JavaScript error: , line 0: uncaught exception: [Exception... "An attempt was made to use an object that is not, or is no longer, usable" code: "11" nsresult: "0x8053000b (NS_ERROR_DOM_INVALID_STATE_ERR)" location: "chrome://global/content/bindings/videocontrols.xml Line: 1097"] JavaScript error: , line 0: uncaught exception: [Exception... "An attempt was made to use an object that is not, or is no longer, usable" code: "11" nsresult: "0x8053000b (NS_ERROR_DOM_INVALID_STATE_ERR)" location: "chrome://global/content/bindings/videocontrols.xml Line: 1097"] It seems that the problem is happening because the mozChannels attribute is being accessed in the updateStats method in the videocontrols.xml If a decoder or an audio stream doesn't exist the nsHTMLMediaElement::GetMozChannels returns NS_ERROR_DOM_INVALID_STATE_ERR Should a check be added before trying to get the mozChannles or the exception is being thrown for a reason here?

Fixed via fixing bug 1270853.