Examine source code of NotePad

{
  "manifest_version": 2,
  "name": "NotePad",
  "version": "12",
  "description": "Quick & Easy NotePad. Save Notes & Inserts.",
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "inc/icon16.png",
    "32": "inc/icon32.png",
    "48": "inc/icon48.png",
    "64": "inc/icon64.png",
    "128": "inc/icon128.png"
  },
  "browser_action": {
    "default_title": "NotePad",
    "default_popup": "index.html",
    "default_icon": {
      "16": "inc/icon16.png",
      "32": "inc/icon32.png",
      "48": "inc/icon48.png",
      "64": "inc/icon64.png",
      "128": "inc/icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5013362a-698d-4678-ae8f-d4fe1804326a}"
    }
  }
}