Some common types used in other WebExtension APIs.


The format of an image.
Details about the format and quality of an image.
The soonest that the JavaScript or CSS will be injected into the tab.
Indicates whether a CSS stylesheet injected by tabs.insertCSS should be treated as an "author" or "user" stylesheet.

Browser compatibility

ChromeEdgeFirefoxFirefox for AndroidOpera
ImageDetails Yes *14 *4548 Yes *
ImageFormat Yes *14 *4548 Yes *
RunAt20 * No454815 *
CSSOrigin No No5353 No


This API is based on Chromium's chrome.extensionTypes API. This documentation is derived from extension_types.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.

Document Tags and Contributors

 Contributors to this page: wbamberg, snoack, rolfedh
 Last updated by: wbamberg,