Bug 40433: Now autoconnecting if 'extensions.torlauncher.prompt_at_startup' pref is enabled

We have to pipe reading pref through TorConnectParent.jsm but apart from that it's about what you would expect

browser/components/torconnect/content/aboutTorConnect.js

@@ -177,6 +177,13 @@ class AboutTorConnect {
     }
   }
 
+  async tryAutoConnect() {
+    let shouldConnect = await RPMSendQuery("TorShouldAutoConnect");
+    if (shouldConnect) {
+      this.connect();
+    }
+  }
+
   restoreCopyLogVisibility() {
     this.elemCopyLogButton.setAttribute("hidden", true);
   }
@@ -292,6 +299,10 @@ class AboutTorConnect {
     // Request the most recent bootstrap status info so that a
     // TorBootstrapStatus notification is generated as soon as possible.
     RPMSendAsyncMessage("TorRetrieveBootstrapStatus");
+
+    // if we have already successfully bootstrapped, then skip waiting on
+    // subsequent launches
+    this.tryAutoConnect();
   }
 }