details

object. An object containing either imageData or path properties, and a tabId property.

imageData Optional

pageAction.ImageDataType or object. This is either a single ImageData object or a dictionary object.

Use a dictionary object to specify multiple ImageData objects in different sizes, so the icon does not have to be scaled for a device with a different pixel density. If imageData is a dictionary, the value of each property is an ImageData object, and its name is its size, like this:

{
  16: image16,
  32: image32
}

The browser will choose the image to use depending on the screen's pixel density. See Choosing icon sizes for more information on this.

path Optional

string or object. This is either a relative path to an icon file or a dictionary object.

Use a dictionary object to specify multiple icon files in different sizes, so the icon does not have to be scaled for a device with a different pixel density. If path is a dictionary, the value of each property is a relative path, and its name is its size, like this:

{
  16: "path/to/image16.jpg",
  32: "path/to/image32.jpg"
}

The browser will choose the image to use depending on the screen's pixel density. See Choosing icon sizes for more information on this.

If path is null, this will reset the page action's icon to the icon that was given in the page_action manifest key.

If path is "", this will reset the icon to the browser's global default icon (that is, the icon used if no icon is given in the page_action manifest key).

If path does not point to a valid icon, then no icon will be displayed.

tabId

integer. The ID of the tab whose icon you want to set.

A Promise that will be fulfilled with no arguments once the icon has been set.

Set the icon for the page action when the user clicks it:

browser.pageAction.onClicked.addListener((tab) => {
  browser.pageAction.setIcon({
    tabId: tab.id, path: "icons/icon-48.png"
  });
});

• apply-css