Examine source code of Tab Options - Open source

{
  "manifest_version": 3,
  "name": "Tab Options - Open Source",
  "version": "1.6.1",
  "description": "Detect & merge duplicate tabs, group by domain, save sessions, export/import tabs. Lightweight & open source.",
  "permissions": [
    "tabs",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.30785353.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "icon16.73a1d0a9.png",
      "48": "icon48.55f10320.png"
    },
    "default_title": "Tab Options",
    "default_popup": "popup.079bcde1.html"
  },
  "icons": {
    "16": "icon16.73a1d0a9.png",
    "48": "icon48.55f10320.png",
    "128": "icon128.f8280897.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "browser-polyfill.js"
      ],
      "run_at": "document_start",
      "css": []
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'sha256-uhDXqIca8+8LHsiFEHZ63hPgZ+afR5PQ9Tgby9pua1M='; object-src 'self'"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "browser-polyfill.js",
        "content_script.js",
        "style.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-options@aghontpi.github.com",
      "strict_min_version": "109.0"
    }
  }
}