Specifies the reason a tab was muted or unmuted.


Values of this type are strings. Possible values are:

Tab capture started, forcing a muted state change.
An extension set the muted state. If this is the reason, extensionId in tabs.mutedInfo will contain the ID of the extension responsible.
The user set the muted state.

Browser compatibility

Chrome Edge Firefox Firefox for Android Opera
Basic Support Yes No 47.0 No 33


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.

Document Tags and Contributors

 Contributors to this page: Jeremie, wbamberg
 Last updated by: Jeremie,