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Gets the current zoom factor for the specified tab.

This is an asynchronous function that returns a Promise.

Syntax

var gettingZoom = browser.tabs.getZoom(
  tabId                     // optional integer
)

Parameters

tabIdOptional
integer. The ID of the tab to get the current zoom factor from. Defaults to the active tab of the current window.

Return value

A Promise that will be fulfilled with the tab's current zoom factor, as a number between 0.3 and 3. If the tab could not be found or some other error occurs, the promise will be rejected with an error message.

Examples

Get the zoom factor for the current tab:

function onGot(zoom) {
  console.log(zoom);
}

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

var gettingZoom = browser.tabs.getZoom();
gettingZoom.then(onGot, onError);

Get the zoom factor for the tab whose ID is 2:

function onGot(zoom) {
  console.log(zoom);
}

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

var gettingZoom = browser.tabs.getZoom(2);
gettingZoom.then(onGot, onError);

Example extensions

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxOperaFirefox for Android
getZoomChrome 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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