This is a common error in Firefox. It is logged in console when you try to call on non existent DOM API method. Seeing this error message is very common with methods call to alert(), confirm(), drawImage() (canvas) and window.open(). You may think "how those methods could be 'non-existent'?", since they are standard APIs of the window object. Well, that's true, they can't, but consider the case when browser blocks your alert or pop-up windows. Firefox pop-up blocker will make those methods not available in that context and should silently carry on with the next statement, but instead it throws an error.
To solve this problem:
- make sure you are calling methods on non-null objects;
- remove
alert(),confirm()oropen()methods in unload event handler. FF pop-up blocker ignores allwindow.open()methods in the unload handler.
The flavours of the error message:
- NS_ERROR_NOT_AVAILABLE: Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIDOMWindow.alert]
- NS_ERROR_NOT_AVAILABLE: Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIDOMWindow.confirm]
- NS_ERROR_NOT_AVAILABLE: Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIDOMCanvasRenderingContext2D.drawImage]
At the time of writing the problem has not been fixed.