Examine source code of Notepad

{
  "manifest_version": 2,
  "version": "0.2.0",
  "name": "Notepad",
  "description": "A simple yet powerful notepad with HTML5 support and more",
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png",
    "256": "data/icons/256.png"
  },
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "homepage_url": "https://webextension.org/listing/notepad.html",
  "background": {
    "scripts": [
      "/v2/chrome.action.js",
      "/v2/chrome.contextMenus.create.js",
      "/v2/chrome.runtime.js",
      "/v2/chrome.windows.create.js",
      "/v2/chrome.windows.get.js",
      "/v2/chrome.windows.getCurrent.js",
      "worker.js"
    ]
  },
  "options_ui": {
    "page": "data/options/index.html"
  },
  "browser_action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{81231243-7deb-4d81-bc8a-4a7f3eb62144}"
    }
  }
}