Examine source code of Indeed Date Scout

{
  "manifest_version": 3,
  "name": "Indeed Date Scout",
  "version": "1.2.2",
  "description": "Reveal the real posting date and block unwanted companies on Indeed.",
  "browser_specific_settings": {
    "gecko": {
      "id": "indeed-date-scout@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "128": "icons/indeed-date-reveal-128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icons/indeed-date-reveal-128.png",
    "default_title": "Indeed Date Scout Settings"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "host_permissions": [
    "*://indeed.com/*",
    "*://*.indeed.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://indeed.com/*",
        "*://*.indeed.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "scripts/pageHook.js",
        "styles.css"
      ],
      "matches": [
        "*://*.indeed.com/*"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'none'"
  }
}