Examine source code of Link Password

{
  "description": "Link Password - Encrypt and decrypt your bookmarks for keep them safe.",
  "manifest_version": 2,
  "name": "link-password",
  "version": "5.0.5",
  "homepage_url": "http://evigfilosofi.se",
  "icons": {
    "48": "icons/icon.svg"
  },
  "applications": {
    "gecko": {
      "id": "LinkPassword@EvighetensFilosofi",
      "strict_min_version": "57.0"
    }
  },
  "permissions": [
    "bookmarks",
    "notifications",
    "storage"
  ],
  "background": {
    "scripts": [
      "app/RandomName.js",
      "app/Package.js",
      "app/Encryptify.js",
      "background.js"
    ]
  },
  "options_ui": {
    "page": "app/info.html"
  },
  "browser_action": {
    "default_title": "Link Password",
    "default_icon": {
      "48": "icons/icon.svg"
    },
    "default_popup": "app/bookmarks.html"
  },
  "protocol_handlers": [
    {
      "protocol": "ext+linkpassword",
      "name": "Link Password - Encrypted Link",
      "uriTemplate": "app.html#%s"
    }
  ]
}