Examine source code of TheUselessAddon

{
  "description": "Addon Version of www.theuselessweb.com",
  "manifest_version": 2,
  "name": "TheUselessAddon",
  "version": "1.1",
  "homepage_url": "https://www.theuselessweb.com",
  "icons": {
    "48": "icons/icon_48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon_32.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{265e5a0a-ebb3-4d10-9064-6a37a629d1ed}"
    }
  }
}