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Zooms the specified tab.

This is an asynchronous function that returns a Promise.

Syntax

var zooming = browser.tabs.setZoom(
  tabId,           // optional integer
  zoomFactor       // number
)

Parameters

tabIdOptional
integer. The ID of the tab to zoom. Defaults to the active tab of the current window.
zoomFactor
number. The new zoom factor. Use a value of 0 here to set the tab to its current default zoom factor. Otherwise, this must be  a number between 0.3 and 3, specifying a zoom factor.

Return value

A Promise that will be fulfilled with no arguments after the zoom factor has been changed. If the tab could not be found or some other error occurs, the promise will be rejected with an error message.

Examples

Set the zoom factor for the current tab to 2:

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

var setting = browser.tabs.setZoom(2);
setting.then(null, onError);

Set the zoom factor for the tab whose ID is 16 tab to 0.5:

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

var setting = browser.tabs.setZoom(16, 0.5);
setting.then(null, onError);

Example extensions

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxOperaFirefox for Android
setZoomChrome Full support YesEdge No support NoFirefox Full support 45Opera Full support YesFirefox Android No support No

Legend

Full support  
Full support
No support  
No support
Acknowledgements

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.

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