details

An object with the following properties:

tabId Optional

integer. Specifies the tab to get the badge background color from.

windowId Optional

integer. Specifies the window from which to get the badge background color.

• If windowId and tabId are both supplied, the function fails.
• If windowId and tabId are both omitted, the global badge background color is returned.

A Promise that will be fulfilled with the retrieved color as a browserAction.ColorArray.

Log the badge's background color:

function onGot(color) {
  console.log(color);
}

function onFailure(error) {
  console.log(error);
}

browser.browserAction.getBadgeBackgroundColor({}).then(onGot, onFailure);