Examine source code of chillout-page-action

{
  "manifest_version": 2,
  "name": "chillout-page-action",
  "version": "1.0",
  "description": "Show a page action after a period of inactivity. Show cat gifs when the page action is clicked.",
  "homepage_url": "https://github.com/mdn/webextensions-examples/tree/master/chill-out",
  "icons": {
    "48": "icons/chillout-48.png"
  },
  "permissions": [
    "alarms",
    "tabs"
  ],
  "page_action": {
    "default_icon": "icons/chillout-32.png",
    "default_title": "Chill out"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dfb5dbe2-a016-4b43-b96e-fc6c97cef0b8}"
    }
  }
}