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tabs.captureTab()

files/en-us/mozilla/add-ons/webextensions/api/tabs/capturetab/index.md

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Creates a data URL encoding the image of an area of the given tab. You must have the <all_urls> permission to use this method.

This is an asynchronous function that returns a Promise.

Syntax

js-nolint
let capturing = browser.tabs.captureTab(
  tabId,               // optional integer
  options              // optional extensionTypes.ImageDetails
)

Parameters

  • tabId {{optional_inline}}
    • : integer. ID of the tab to capture. Defaults to the active tab in the current window.
  • options {{optional_inline}}
    • : {{WebExtAPIRef('extensionTypes.ImageDetails')}}.

Return value

A Promise that will be fulfilled with a data URL which encodes the captured image. May be assigned to the 'src' property of an HTML Image element for display. If any error occurs the promise will be rejected with an error message.

Examples

Capture an image of the active tab in the current window, with default settings:

js
function onCaptured(imageUri) {
  console.log(imageUri);
}

function onError(error) {
  console.log(`Error: ${error}`);
}

browser.browserAction.onClicked.addListener(() => {
  let capturing = browser.tabs.captureTab();
  capturing.then(onCaptured, onError);
});

{{WebExtExamples}}

Browser compatibility

{{Compat}}

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

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