Examine source code of Todo

{
  "description": "A todo addon which lets you to keep a track of your work, stays in browser and available on just a click",
  "manifest_version": 2,
  "name": "Todo",
  "version": "2.0",
  "homepage_url": "https://github.com/tsl143/jsDemos/todo_webext",
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png"
  },
  "applications": {
    "gecko": {
      "id": "{993d7fd9-f6ba-434a-9949-2483488a8db6}"
    }
  },
  "browser_action": {
    "default_icon": "icons/logo_32.png",
    "default_title": "ToDo",
    "default_popup": "popup/index.html"
  },
  "permissions": [
    "storage"
  ]
}