Issue 2879 - Move element selection into the content process

lib/main.js

Index: lib/main.js
===================================================================
--- a/lib/main.js
+++ b/lib/main.js
@@ -22,17 +22,16 @@ let elementMarkerClass = null;
 {
   let rnd = [];
   let offset = "a".charCodeAt(0);
   for (let i = 0; i < 20; i++)
     rnd.push(offset + Math.random() * 26);
 
   elementMarkerClass = String.fromCharCode.apply(String, rnd);
 }
-exports.elementMarkerClass = elementMarkerClass;
 
 // Load CSS asynchronously
 let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIXMLHttpRequest);
 request.open("GET", "chrome://elemhidehelper/content/elementmarker.css");
 request.overrideMimeType("text/plain");
 request.addEventListener("load", function(event)
 {
   if (onShutdown.done)
@@ -43,16 +42,18 @@ request.addEventListener("load", functio
   let styleURI = Services.io.newURI("data:text/css," + encodeURIComponent(data), null, null);
   styleService.loadAndRegisterSheet(styleURI, Ci.nsIStyleSheetService.USER_SHEET);
   onShutdown.add(() => styleService.unregisterSheet(styleURI, Ci.nsIStyleSheetService.USER_SHEET));
 }, false);
 request.send(null);
 
 // Load our process script
 let info = require("info");
+info.elementMarkerClass = elementMarkerClass;
+
 let processScript = info.addonRoot + "lib/child/bootstrap.js?" +
     elementMarkerClass + "&" +
     "info=" + encodeURIComponent(JSON.stringify(info));
 let messageManager = Cc["@mozilla.org/parentprocessmessagemanager;1"]
                        .getService(Ci.nsIProcessScriptLoader);
 messageManager.loadProcessScript(processScript, true);
 onShutdown.add(() => {
   messageManager.removeDelayedProcessScript(processScript);