diff --git a/index.js b/index.js
index e1cd577..731027d 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,8 @@
 /* global require */
 const {ContextualIdentityService} = require('resource://gre/modules/ContextualIdentityService.jsm');
+const { Cc, Ci, Cu, Cr } = require('chrome');
+
+Cu.import("resource://gre/modules/Services.jsm");
 
 const tabs = require('sdk/tabs');
 const webExtension = require('sdk/webextension');
@@ -167,6 +170,25 @@ const contextualIdentities = {
   remove: removeContainer
 };
 
+function openTab(args) {
+  let browserWin = Services.wm.getMostRecentWindow("navigator:browser");
+
+  // This should not really happen.
+  if (!browserWin || !browserWin.gBrowser) {
+    return Promise.resolve(false);
+  }
+
+  let userContextId = 0;
+  if ("containerId" in args) {
+    userContextId = parseInt(args.containerId.substr(CONTAINER_STORE.length), 10);
+  }
+
+  let tab = browserWin.gBrowser.addTab(args.url || null,
+                                       { userContextId: userContextId })
+  browserWin.gBrowser.selectedTab = tab;
+  return Promise.resolve(true);
+}
+
 function handleWebExtensionMessage(message, sender, sendReply) {
   switch (message.method) {
       case 'query':
@@ -198,6 +220,9 @@ function handleWebExtensionMessage(message, sender, sendReply) {
         tabs.open('about:preferences#containers');
         sendReply({content: 'opened'});
         break;
+      case 'openTab':
+        sendReply(openTab(message));
+        break;
   }
 }
 
diff --git a/webextension/js/popup.js b/webextension/js/popup.js
index 0978b12..b8870a3 100644
--- a/webextension/js/popup.js
+++ b/webextension/js/popup.js
@@ -31,9 +31,10 @@ function showContainerTabs(containerId) {
     cookieStoreId: containerId
   }).then(hiddenTabUrls=> {
     hiddenTabUrls.forEach(url=> {
-      browser.tabs.create({
-        url: url,
-        cookieStoreId: containerId
+      browser.runtime.sendMessage({
+        method: 'openTab',
+        containerId: containerId,
+        url: url
       });
     });
   });
@@ -94,7 +95,7 @@ browser.runtime.sendMessage({method: 'query'}).then(identities=> {
           }
         });
       } else if (e.target.matches('.newtab-icon')) {
-        browser.tabs.create({cookieStoreId: containerId});
+        browser.runtime.sendMessage({method: 'openTab', containerId: containerId});
         window.close();
       }
     });