Examine source code of Upwork Email Guard

{
  "manifest_version": 2,
  "name": "Upwork Email Guard",
  "version": "1.0",
  "description": "Prevents accidental sharing of email addresses and phone numbers on Upwork — protects your account from ToS violations and bans.",
  "permissions": [
    "activeTab",
    "*://*.upwork.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.upwork.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "upwork-email-guard@christianvergara",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "128": "icon.png"
  }
}