Defines whether zoom changes will persist for the page's origin, or only take effect in this tab. This defaults to per-origin when tabs.zoomSettingsMode is "automatic", and is always per-tab otherwise.


Values of this type are strings. Possible values are:


All other tabs with the same origin as this tab will have the zoom changes applied to them. This scope is only available if tabs.zoomSettingsMode is "automatic".


Zoom changes only take effect in this tab, and zoom changes in other tabs will not affect the zooming of this tab. Also:

  • in Firefox the zoom level persists across page loads and navigation within the tab.
  • in Chrome-based browsers zoom changes are reset on navigation; navigating a tab will always load pages with their per-origin zoom factors.

Browser compatibility

BCD tables only load in the browser

Note: This API is based on Chromium's chrome.tabs API. This documentation is derived from tabs.json in the Chromium code.