Examine source code of Masking Email Generator

{
  "manifest_version": 2,
  "name": "Masking Email Generator",
  "version": "1.0.0",
  "short_name": "Random email masking generator for custom domains.",
  "description": "This add-on allows users to generate random email addresses for a catch-all domain that they own on registration and login forms. This is useful for email masking and preventing spam. Custom domain should be set in the add-on preferences.",
  "icons": {
    "128": "icons/emailMaskerLogo.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "styles/plugin.css"
      ],
      "js": [
        "scripts/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/emailMaskerLogo.png"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true,
    "open_in_tab": false
  },
  "version_info": "For detailed version history, see the CHANGELOG.md in the project repository.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{66affc07-679d-4d41-8eb7-3d7bbd28c504}"
    }
  }
}