Examine source code of Color Switcher

{
  "manifest_version": 2,
  "name": "Color Switcher",
  "version": "1.0",
  "description": "Switches the colors of the web page on button click",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "Switch Colors",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{145d76ca-b9df-4414-806f-b70ca37aabb1}"
    }
  }
}