diff --git a/webextension/background.js b/webextension/background.js
new file mode 100644
index 0000000..9b707c8
--- /dev/null
+++ b/webextension/background.js
@@ -0,0 +1,18 @@
+browser.tabs.onCreated.addListener(tab => {
+  if (tab.incognito) {
+    disableAddon(tab.id);
+  }
+});
+
+browser.tabs.query({}).then(tabs => {
+  for (let tab of tabs) { // eslint-disable-line prefer-const
+    if (tab.incognito) {
+      disableAddon(tab.id);
+    }
+  }
+}).catch(() => {});
+
+function disableAddon(tabId) {
+ browser.browserAction.disable(tabId);
+ browser.browserAction.setTitle({ tabId, title: "Containers disabled in Private Browsing Mode" });
+}
diff --git a/webextension/manifest.json b/webextension/manifest.json
index 54e137d..267bd9e 100644
--- a/webextension/manifest.json
+++ b/webextension/manifest.json
@@ -32,6 +32,9 @@
     },
     "default_title": "Containers",
     "default_popup": "popup.html"
-  }
+  },
 
+  "background": {
+    "scripts": ["background.js"]
+  }
 }