diff --git a/platform/chromium/manifest.json b/platform/chromium/manifest.json
index dc2968d..8c8f25c 100644
--- a/platform/chromium/manifest.json
+++ b/platform/chromium/manifest.json
@@ -71,6 +71,7 @@
         "browsingData",
         "contentSettings",
         "cookies",
+        "privacy",
         "storage",
         "tabs",
         "unlimitedStorage",
diff --git a/platform/chromium/vapi-background.js b/platform/chromium/vapi-background.js
index 6875441..473d4fb 100644
--- a/platform/chromium/vapi-background.js
+++ b/platform/chromium/vapi-background.js
@@ -42,6 +42,27 @@ var noopFunc = function(){};
 
 /******************************************************************************/
 
+// https://github.com/gorhill/uMatrix/issues/234
+// https://developer.chrome.com/extensions/privacy#property-network
+chrome.privacy.network.networkPredictionEnabled.set({
+    value: false
+});
+
+// rhill 2013-12-07:
+// Tell Chromium to allow all javascript: µMatrix will control whether
+// javascript execute through `Content-Policy-Directive` and webRequest.
+//   https://github.com/gorhill/httpswitchboard/issues/74
+chrome.contentSettings.javascript.set({
+    primaryPattern: 'https://*/*',
+    setting: 'allow'
+});
+chrome.contentSettings.javascript.set({
+    primaryPattern: 'http://*/*',
+    setting: 'allow'
+});
+
+/******************************************************************************/
+
 vAPI.app = {
     name: manifest.name,
     version: manifest.version
@@ -680,20 +701,6 @@ vAPI.net.registerListeners = function() {
     // <<<<<<<<
     // End of: Normalizing request types
 
-
-    // rhill 2013-12-07:
-    // Tell Chromium to allow all javascript: µMatrix will control whether
-    // javascript execute through `Content-Policy-Directive` and webRequest.
-    //   https://github.com/gorhill/httpswitchboard/issues/74
-    chrome.contentSettings.javascript.set({
-        primaryPattern: 'https://*/*',
-        setting: 'allow'
-    });
-    chrome.contentSettings.javascript.set({
-        primaryPattern: 'http://*/*',
-        setting: 'allow'
-    });
-
     // Network event handlers
     // >>>>>>>>
     var onBeforeRequestClient = this.onBeforeRequest.callback;
diff --git a/platform/firefox/frameModule.js b/platform/firefox/frameModule.js
index 2c0bf5f..170ffd7 100644
--- a/platform/firefox/frameModule.js
+++ b/platform/firefox/frameModule.js
@@ -192,6 +192,13 @@ const contentObserver = {
             return;
         }
 
+        // https://github.com/gorhill/uBlock/issues/260
+        // TODO: We may have to skip more types, for now let's be
+        // conservative, i.e. let's not test against `text/html`.
+        if ( doc.contentType.lastIndexOf('image/', 0) === 0 ) {
+            return;
+        }
+
         if ( loc.protocol !== 'http:' && loc.protocol !== 'https:' && loc.protocol !== 'file:' ) {
             if ( loc.protocol === 'chrome:' && loc.host === hostName ) {
                 this.initContentScripts(win);
diff --git a/platform/firefox/vapi-background.js b/platform/firefox/vapi-background.js
index 430c371..45ddff1 100644
--- a/platform/firefox/vapi-background.js
+++ b/platform/firefox/vapi-background.js
@@ -625,6 +625,9 @@ vAPI.tabs.getAll = function(callback) {
             continue;
         }
         for ( tab of tabBrowser.tabs ) {
+            if ( tab.hasAttribute('pending') ) {
+                continue;
+            }
             tabs.push({
                 id: this.getTabId(tab),
                 url: getBrowserForTab(tab).currentURI.asciiSpec
@@ -1895,6 +1898,9 @@ vAPI.lastError = function() {
 vAPI.onLoadAllCompleted = function() {
     for ( var tab of this.tabs.getAllSync() ) {
         // We're insterested in only the tabs that were already loaded
+        if ( tab.hasAttribute('pending') ) {
+            continue;
+        }
         getBrowserForTab(tab).messageManager.sendAsyncMessage(
             location.host + '-load-completed'
         );