Issue 2850 - Get rid of synchronous XMLHttpRequest on startup, embed JSON files directly instead

bootstrap.js.tmpl

Index: bootstrap.js.tmpl
===================================================================
--- a/bootstrap.js.tmpl
+++ b/bootstrap.js.tmpl
@@ -78,17 +78,17 @@ function shutdown(params, reason)
   require.scopes = null;
   addonData = null;
 }
 
 function install(params, reason) {}
 
 function uninstall(params, reason)
 {
-  {%- if hasVersionPref %}
+  {%- if 'currentVersion' in jsonRequires.get('prefs.json', {}).get('defaults', {}) %}
   const ADDON_UNINSTALL = 6;  // https://developer.mozilla.org/en/Extensions/Bootstrapped_extensions#Reason_constants
   if (reason == ADDON_UNINSTALL)
   {
     // Users often uninstall/reinstall extension to "fix" issues. Clear current
     // version number on uninstall to rerun first-run actions in this scenario.
     Services.prefs.clearUserPref("extensions.{{metadata.get('general', 'basename')}}.currentVersion");
   }
   {%- endif %}
@@ -168,16 +168,19 @@ function require(module)
       Services.scriptloader.loadSubScript(url, scopes[module]);
     {%- if 'info' in requires %}
     }
     {%- endif %}
   }
   return scopes[module].exports;
 }
 require.scopes = Object.create(null);
+{%- for name, data in jsonRequires.iteritems() %}
+require.scopes[{{name|json}}] = {exports: {{data|json}}};
+{%- endfor %}
 
 {%- if hasChromeRequires %}
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 
 let RequireObserver =
 {
   observe: function(subject, topic, data)
   {