User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:30.0) Gecko/20100101 Firefox/30.0 (Beta/Release) Build ID: 20140508142553 Steps to reproduce: Switched debugger's page js file in the left panel. Actual results: It gave this instead of the js source in the textbox: Could not load the source for javascript:self.on("click", function (junk) {self.postMessage("junk");});. [Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIChannel.asyncOpen]" nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)" location: "JS frame :: resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/devtools/server/main.js -> resource://gre/modules/devtools/server/actors/script.js :: fetch :: line 5218" data: no]Line: 5218, column: 0 Expected results: It should always show the source.