Examine source code of Colour Flipper Fun

{
  "manifest_version": 2,
  "name": "Colour Flipper Fun",
  "version": "1.0",
  "description": "Color flippers are an entertaining way to add a bit of life to a website or application. it is possible to create a color flipper that will change the background color of an element with a click of a button",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/flip-logo.png"
    }
  },
  "icons": {
    "128": "images/flip-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8c223c0c-1036-48a6-a441-2c779e67f572}"
    }
  }
}