Examine source code of Secure Password generator

{
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  "version": "1.0",
  "manifest_version": 2,
  "description": "__MSG_description__",
  "author": "__MSG_author__",
  "default_locale": "en",
  "permissions": [
    "storage",
    "<all_urls>",
    "contextMenus",
    "clipboardWrite"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/script.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "js/background.js",
      "js/script.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icons/icon.png",
    "32": "icons/icon.png",
    "48": "icons/icon.png",
    "128": "icons/icon.png"
  },
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_popup": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "kv47871@gmail.com",
      "strict_min_version": "42.1"
    }
  }
}