Why do I keep receiving failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIDOMWindow.content] everytime I load a new HTML5 page.

Question

Every time I try to load an HTML5 webpage in Firefox 15.0.1 I get the "Error: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIDOMWindow.content] Source File: Line: 231" message. I checked the documentation at https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/nsIDOMWindow and it doesn't even show that this object HAS a "content" attribute. I have no idea what is causing this error since there is no module referenced, just the above source file line number. I checked the webpages being loaded and they don't even have line numbers 231 that I can detect.
The webpages seem to load and function correctly, but it is a nuisance to keep getting this error. Yes, I have a lot of extensions and add-ons in my Firefox, but since no module is ever referenced in the error message, I can only guess that the problem is in the basic Firefox core.
Thanks to anyone who can shed some light on the cause of this error.

Answer 1

I kept getting this error from a page I created. I used a <nowiki><div id="content" ></nowiki>
and then used JavaScript to build the content.
nsIDOMWindow.content error went away when I changed my div id
<nowiki><div id="contentDiv" ></nowiki>
Well, another day and the same error shows up when my primary window opens a child window. I close the child and open again, then 2 nsIDOMWindow.content errors;
close child and open child again and then 3 nsIDOMWindow.content errors...