Call this function to set up a connection between the add-on's background scripts (or other privileged scripts, such as popup scripts or options page scripts) and any content scripts that belong to this add-on and are running in the specified tab. This function returns a runtime.Port object.

When this is called, the runtime.onConnect event will be fired in any content script belonging to this add-on that are running in the specified tab. The event listener will be passed another runtime.Port object. The two sides can then use the Port objects to exchange messages.

For more details, see connection-based messaging.


  tabId,      // integer
  connectInfo // optional object

This API is also available as browser.tabs.connect().


integer. ID of the tab whose content scripts we want to connect to.
string. Will be passed into runtime.onConnect event listeners in content scripts belonging to this add-on and running in the specified tab.
integer. Open a port to a specific frame identified by frameId instead of all frames in the tab.

Return value

runtime.Port. A port that can be used to communicate with the content scripts running in the specified tab.

Browser compatibility

Chrome Edge Firefox Firefox for Android Opera
Basic support Yes No 45.0 No 33


In this example a background script listens for a click on a browser action, then connects to the currently active tab, then sends a message using the Port that's returned from connect():

function connectToTab(tabs) {
  if (tabs.length > 0) {
    var examplePort = chrome.tabs.connect(
      {name: "tabs-connect-example"}
    examplePort.postMessage({greeting: "hi from background script"});

chrome.browserAction.onClicked.addListener(function() {
  chrome.tabs.query({currentWindow: true, active: true}, connectToTab);


This API is based on Chromium's chrome.tabs API. This documentation is derived from tabs.json in the Chromium code.

Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.

Document Tags and Contributors

 Contributors to this page: Makyen, Jeremie, wbamberg, PushpitaPikuDey, kmaglione
 Last updated by: Makyen,