diff --git a/src/_locales/en/messages.json b/src/_locales/en/messages.json
index 0e2f0f9..455775a 100644
--- a/src/_locales/en/messages.json
+++ b/src/_locales/en/messages.json
@@ -135,6 +135,10 @@
         "message": "Go to dashboard",
         "description": "A menu entry in the matrix popup"
     },
+    "matrixNoTabFound" : {
+        "message": "No web page found",
+        "description": "Displays in place of matrix when no data is found for the current page"
+    },
 
     "statsPageTitle" : {
         "message": "uMatrix &ndash; Statistics",
diff --git a/src/asset-viewer.html b/src/asset-viewer.html
index 9261c54..314e6c6 100644
--- a/src/asset-viewer.html
+++ b/src/asset-viewer.html
@@ -2,6 +2,7 @@
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
 <title>uMatrix — Asset viewer</title>
 <style>
 #content {
diff --git a/src/css/popup.css b/src/css/popup.css
index 01d088f..a60faa9 100644
--- a/src/css/popup.css
+++ b/src/css/popup.css
@@ -623,6 +623,21 @@ body.colorblind .rw .matCell.t2 #blacklist:hover {
     opacity: 1;
     }
 
+/* No data was found for the tab */
+
+body.noTabFound .paneHead,
+body.noTabFound .paneContent {
+    display: none;
+    }
+body.noTabFound #noTabFound {
+    align-items: center;
+    color: gray;
+    display: flex;
+    font-size: xx-large;
+    height: 100vh;
+    justify-content: center;
+    }
+
 /* Mobile-friendly rules */
 
 body.hConstrained {
diff --git a/src/dashboard.html b/src/dashboard.html
index 1fa2196..4aa231c 100644
--- a/src/dashboard.html
+++ b/src/dashboard.html
@@ -2,6 +2,7 @@
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
 <link rel="shortcut icon" type="image/png" href="img/icon_16.png">
 <title data-i18n="dashboardPageName"></title>
 <style>
diff --git a/src/js/messaging.js b/src/js/messaging.js
index f3516f6..3bb1e49 100644
--- a/src/js/messaging.js
+++ b/src/js/messaging.js
@@ -288,7 +288,7 @@ var matrixSnapshotFromTabId = function(details, callback) {
 
     // Fall back to currently active tab
     var onTabReady = function(tab) {
-        if ( typeof tab !== 'object' ) {
+        if ( tab instanceof Object === false ) {
             callback('ENOTFOUND');
             return;
         }
diff --git a/src/js/popup.js b/src/js/popup.js
index f27988a..04de695 100644
--- a/src/js/popup.js
+++ b/src/js/popup.js
@@ -166,8 +166,8 @@ var messager = vAPI.messaging.channel('popup.js');
 /******************************************************************************/
 
 function getUserSetting(setting) {
-    return matrixSnapshot.userSettings[setting];
-}
+        return matrixSnapshot.userSettings[setting];
+    }
 
 function setUserSetting(setting, value) {
     matrixSnapshot.userSettings[setting] = value;
@@ -1078,9 +1078,15 @@ var makeMenu = function() {
 // Do all the stuff that needs to be done before building menu et al.
 
 function initMenuEnvironment() {
-    uDom('body').css('font-size', getUserSetting('displayTextSize'));
-    uDom('body').toggleClass('colorblind', getUserSetting('colorBlindFriendly') === true);
-    uDom('#version').text(matrixSnapshot.appVersion || '');
+    document.body.style.setProperty(
+        'font-size',
+        getUserSetting('displayTextSize')
+    );
+    document.body.classList.toggle(
+        'font-size',
+        getUserSetting('colorBlindFriendly')
+    );
+    uDom.nodeFromId('version').textContent = matrixSnapshot.appVersion || '';
 
     var prettyNames = matrixHeaderPrettyNames;
     var keys = Object.keys(prettyNames);
@@ -1330,6 +1336,13 @@ function dropDownMenuHide() {
 /******************************************************************************/
 
 var onMatrixSnapshotReady = function(response) {
+    if ( response === 'ENOTFOUND' ) {
+        uDom.nodeFromId('noTabFound').textContent =
+            vAPI.i18n('matrixNoTabFound');
+        document.body.classList.add('noTabFound');
+        return;
+    }
+
     // Now that tabId and pageURL are set, we can build our menu
     initMenuEnvironment();
     makeMenu();
@@ -1443,7 +1456,7 @@ var matrixSnapshotPoller = (function() {
             if ( typeof response === 'object' ) {
                 matrixSnapshot = response;
             }
-            onMatrixSnapshotReady();
+            onMatrixSnapshotReady(response);
             pollAsync();
         };
 
diff --git a/src/logger-ui.html b/src/logger-ui.html
index a33e727..ea0f57a 100644
--- a/src/logger-ui.html
+++ b/src/logger-ui.html
@@ -2,6 +2,7 @@
 <html>
 <head>
 <meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
 <link rel="stylesheet" type="text/css" href="css/common.css">
 <link rel="stylesheet" type="text/css" href="css/logger-ui.css">
 <link rel="shortcut icon" type="image/png" href="img/icon_16.png">
diff --git a/src/main-blocked.html b/src/main-blocked.html
index 3bd5e59..e7ac2a9 100644
--- a/src/main-blocked.html
+++ b/src/main-blocked.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <html>
 <head>
+<meta name="viewport" content="width=device-width, initial-scale=1">
 <title></title>
 <link rel="stylesheet" href="css/common.css" type="text/css">
 <style>
diff --git a/src/popup.html b/src/popup.html
index 8abac86..9959465 100644
--- a/src/popup.html
+++ b/src/popup.html
@@ -78,6 +78,8 @@
     <div id="noNetTrafficPrompt" style="display:none;text-align:center;font-size:large"></div>
 </div>
 
+<div id="noTabFound"></div>
+
 <!-- Convenient to auto-fetch locale strings used in scripts -->
 <div style="display: none;">
     <span data-i18n="matrixBlacklistedHostnames"></span>
