MDN wants to talk to developers like you: https://qsurvey.mozilla.com/s3/8d22564490d8

icons

Type Object
Mandatory No
Example
"icons": {
  "48": "icon.png",
  "96": "icon@2x.png"
}

The icons key specifies icons for your extension. Those icons will be used to represent the extension in components such as the Add-ons Manager.

It consists of key-value pairs of image size in px and image path relative to the root directory of the extension.

If icons is not supplied, a standard extension icon will be used by default.

You should supply at least a main extension icon, ideally 48x48 px in size. This is the default icon that will be used in the Add-ons Manager. You may, however, supply icons of any size and Firefox will attempt to find the best icon to display in different components.

Firefox will consider the screen resolution when choosing an icon. To deliver the best visual experience to users with high-resolution displays, such as Retina displays, provide double-sized versions of all your icons.

Example

The keys in the icons object specify the icon size in px, values specify the relative icon path. This example contains a 48px extension icon and a larger version for high-resolution displays.

"icons": {
  "48": "icon.png",
  "96": "icon@2x.png"
}

Browser compatibility

ChromeEdgeFirefoxFirefox for AndroidOpera
Basic supportYesYes4848Yes

Document Tags and Contributors

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