Boolean value, true for content scripts running inside private browsing tabs and for extension pages running inside a private browsing process.

Browser compatibility

ChromeEdgeFirefoxFirefox for AndroidOpera
Basic support Yes174548 Yes


This API is based on Chromium's chrome.extension API. This documentation is derived from extension.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
Last updated by: wbamberg,