Examine source code of Chill-O

{
  "manifest_version": 2,
  "name": "Chill-O",
  "version": "6.9.3",
  "description": "Show a page action after a period of inactivity. Show cat gifs when the page action is clicked.",
  "icons": {
    "48": "icons/chill-o-48.png"
  },
  "permissions": [
    "alarms",
    "tabs"
  ],
  "page_action": {
    "default_icon": "icons/chill-o-32.png",
    "default_title": "Chill-o"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1f1f82b-3fee-4159-ba20-65eb7f00567f}"
    }
  }
}