I have Firefox 20.0.1. It says it is the latest version. One .aspx page is generating this error:

"TypeError: this._containers is undefined @ resource://gre/modules/devtools/MarkupView.jsm:331"

I am not using any file like that. So, I assume this is an internal file of Firefox.

Firefox site reports that this is in regards to JQuery. I am not using that. So, I assume Firefox is using it internally. I am unable to find any other information as to know what is causing this.