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This method has been deprecated. Use {{WebExtAPIRef("runtime.sendMessage")}} instead.

Sends a single request to other listeners within the extension. Similar to {{WebExtAPIRef('runtime.connect')}}, but only sends a single request with an optional response. The {{WebExtAPIRef('extension.onRequest')}} event is fired in each page of the extension.


  extensionId,             // optional string
  request,                 // any
  function(response) {...} // optional function

This API is also available as browser.extension.sendRequest() in a version that returns a promise.


string. The extension ID of the extension you want to connect to. If omitted, default is your own extension.
function. The function is passed the following arguments:


any. The JSON response object sent by the handler of the request. If an error occurs while connecting to the extension, the callback will be called with no arguments and {{WebExtAPIRef('runtime.lastError')}} will be set to the error message.


Browser compatibility




This API is based on Chromium's chrome.extension API. This documentation is derived from extension.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, wbamberg
Last updated by: Makyen,