More robust initialization sequence.

Author: hackademix

src/bg/RequestGuard.js

@@ -818,6 +818,7 @@
   };
 
   async function injectPolicyScript(details) {
+    await ns.initializing;
     const {url, tabId, frameId} = details;
     const domPolicy = await ns.computeChildPolicy({url}, {tab: {id: tabId}, frameId});
     domPolicy.navigationURL = url;

src/bg/main.js

@@ -199,7 +199,6 @@
     },
 
     async fetchChildPolicy({url, contextUrl}, sender) {
-      await ns.initializing;
       return await ns.computeChildPolicy(...arguments);
     },
 
@@ -306,6 +305,7 @@
     },
 
     async computeChildPolicy({url, contextUrl}, sender) {
+      await ns.initializing;
       let {tab} = sender;
       let policy = ns.policy;
       const {isTorBrowser} = ns.local;