Examine source code of Password derivative extension

{
  "name": "Password derivative extension",
  "description": "Protect your passwords by ensuring none of them are the same. Convert your password to a domain-based unique derivative, using non-reversible hash encryption.",
  "homepage_url": "https://github.com/password-derivative/firefoxaddon",
  "manifest_version": 2,
  "version": "1.3",
  "default_locale": "en",
  "icons": {
    "48": "icons/link-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "password-derivative@eenblauwehemel.nl",
      "strict_min_version": "96.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./lib/tldjs@2.1.0.js",
        "./content.js"
      ]
    }
  ],
  "permissions": [
    "alarms",
    "contextMenus",
    "notifications",
    "storage",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "./lib/core-min.js",
      "./lib/cipher-core-min.js",
      "./lib/aes-min.js",
      "./lib/hmac-sha256.js",
      "./lib/hmac-sha384.js",
      "./lib/hmac-sha512.js",
      "./lib/hmac-sha3.js",
      "./lib/scrypt.js",
      "./lib/enc-base64-min.js",
      "./lib/enc-utf16-min.js",
      "./lib/format-hex-min.js",
      "./lib/tldjs@2.1.0.js",
      "background.js"
    ]
  },
  "commands": {
    "toggle-feature": {
      "suggested_key": {
        "default": "Ctrl+Space"
      },
      "description": "Send a 'toggle-feature' event to the extension"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}