Examine source code of Random password generator

{
  "manifest_version": 2,
  "name": "Random password generator",
  "short_name": "Random password generator",
  "description": "A simple random password generator for Firefox browser",
  "version": "2.6",
  "developer": {
    "name": "Matija Matečić",
    "url": "https://matija.matecic.com/"
  },
  "icons": {
    "48": "lib/icon.svg",
    "96": "lib/icon.svg"
  },
  "browser_action": {
    "default_title": "Random password generator",
    "default_popup": "random-password-generator.htm",
    "default_icon": "lib/icon.svg",
    "theme_icons": [
      {
        "dark": "lib/icon.svg",
        "light": "lib/icon-dark.svg",
        "size": 16
      },
      {
        "dark": "lib/icon.svg",
        "light": "lib/icon-dark.svg",
        "size": 32
      }
    ]
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{acb7ff51-f1c2-43cf-9af5-f9f2d955fb02}"
    }
  }
}