Examine source code of Daily Planner

{
  "manifest_version": 2,
  "name": "Daily Planner",
  "version": "1.0",
  "description": "Plan your day with ease directly from your browser.",
  "icons": {
    "48": "icons/daily-planner-icon-48.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/daily-planner-icon-48.png",
    "default_popup": "daily-planner-popup.html",
    "default_title": "Daily Planner"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a5378fbc-11df-4fdb-acb0-0d33f9df0a68}"
    }
  }
}