On line 1671 of ext-all-debug.js the line is as follows:

Code:
document.write("<s"+'cript id="ie-deferred-loader" defer="defer" src="
The corresponding statement in ext-all.js file is:

Code:
document.write("<s"+"cript id=\"ie-deferred-loader\" defer=\"defer\" src=\"//0\"></s"+"cript>");