Sets the background color for the badge. Tabs without a specific badge background color will inherit the global badge background color, which defaults to [217, 0, 0, 255] in Firefox.


  details // object


The color, specified as one of:
  • a string: any CSS <color> value, for example "red", "#FF0000", or "rgb(255,0,0)". If the string is not a valid color, the returned promise will be rejected and the background color won't be altered.
  • a browserAction.ColorArray object.
  • null. If a tabId is specified, it removes the tab-specific badge background color so that the tab inherits the global badge background color. Otherwise it reverts the global badge background color to the default value.
integer. Sets the badge background color only for the given tab. The color is reset when the user navigates this tab to a new page. If this argument is omitted, the global badge background color is set instead.

Browser compatibility

ChromeEdgeFirefoxFirefox for AndroidOpera
Basic support Yes1445 No Yes
The color property of the details parameter can be set to a string. Yes No Yes1 No ?
The color property of the details parameter can be set to null. No No59 No No

1. Before Firefox 59, invalid color strings behaved as null.

The default color in Firefox is: [217, 0, 0, 255].


A background color that starts off as red, and turns green when the browser action is clicked:

browser.browserAction.setBadgeText({text: "1234"});
browser.browserAction.setBadgeBackgroundColor({color: "red"});

browser.browserAction.onClicked.addListener(()=> {
  browser.browserAction.setBadgeBackgroundColor({color: "green"});

Set the badge background color only for the active tab:

browser.browserAction.setBadgeText({text: "1234"});
browser.browserAction.setBadgeBackgroundColor({color: "red"});

browser.browserAction.onClicked.addListener((tab)=> {
    color: "green",

Example extensions


This API is based on Chromium's chrome.browserAction API. This documentation is derived from browser_action.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

Last updated by: wbamberg,