1. Mozilla
  2. Add-ons
  3. Browser extensions
  4. JavaScript APIs
  5. browserSettings
  6. browserSettings.verticalTabs

browserSettings.verticalTabs

A BrowserSetting object that represents whether the browser has vertical tabs enabled. The object's underlying value is a boolean.

Examples

Set the setting to false, reverting to horizontal tabs:

js
browser.browserSettings.verticalTabs
  .set({ value: false })
  .then((result) => console.log(`Tabs setting was modified: ${result}`));

Browser compatibility

Chrome
Edge
Firefox
Opera
Safari
Firefox for Android
Safari on iOS
verticalTabs
Chrome – No support
Chrome
footnote No support
Edge – No support
Edge
footnote No support
Firefox – Full support
Firefox 142 (Release date: 2025-08-19)
footnote Full support
Opera – No support
Opera
footnote No support
Safari – No support
Safari
footnote No support
Firefox for Android – Full support
Firefox for Android 142 (Release date: 2025-08-19)
footnote Full support
Safari on iOS – No support
Safari on iOS
footnote No support

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Full support
No support

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