diff --git a/platform/chromium/manifest.json b/platform/chromium/manifest.json
index c30d193..8163038 100644
--- a/platform/chromium/manifest.json
+++ b/platform/chromium/manifest.json
@@ -2,7 +2,7 @@
     "manifest_version": 2,
     "name": "uMatrix",
     "short_name": "uMatrix",
-    "version": "1.0.1.2",
+    "version": "1.0.1.3",
     "description": "__MSG_extShortDesc__",
     "icons": {
         "16": "img/icon_16.png",
diff --git a/platform/chromium/vapi-background.js b/platform/chromium/vapi-background.js
index 162410b..5fa4d8a 100644
--- a/platform/chromium/vapi-background.js
+++ b/platform/chromium/vapi-background.js
@@ -278,7 +278,8 @@ vAPI.tabs.open = function(details) {
     }
 
     chrome.tabs.query({ url: targetURL }, function(tabs) {
-        var tab = tabs[0];
+        if ( chrome.runtime.lastError ) { /* noop */ }
+        var tab = Array.isArray(tabs) && tabs[0];
         if ( tab ) {
             chrome.tabs.update(tab.id, { active: true }, function(tab) {
                 chrome.windows.update(tab.windowId, { focused: true });
diff --git a/platform/webext/install.rdf b/platform/webext/install.rdf
index 5c9244b..8487254 100644
--- a/platform/webext/install.rdf
+++ b/platform/webext/install.rdf
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:em="http://www.mozilla.org/2004/em-rdf#">
     <Description about="urn:mozilla:install-manifest">
-        <em:id>uMatrix-webext@raymondhill.net</em:id>
+        <em:id>uMatrix@raymondhill.net</em:id>
         <em:version>{version}</em:version>
         <em:name>{name}</em:name>
         <em:description>{description}</em:description>