Examine source code of Color Picker

{
  "manifest_version": 2,
  "name": "Color Picker",
  "version": "1.0",
  "description": "Click to get the color code of an element on the current web page.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4835b75e-31b4-4df0-8e6c-2c5867a6b184}"
    }
  }
}