Examine source code of Hex Color Picker

{
  "manifest_version": 2,
  "name": "Hex Color Picker",
  "version": "1.0",
  "description": "Hex Color Picker. This utility allows users to pick a color by entering a hex color code and see that color displayed on the interface.",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/hex-logo.png"
    }
  },
  "icons": {
    "128": "images/hex-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d0c90fc4-941f-49b4-8107-55cb109b84ee}"
    }
  }
}