Examine source code of FxTwitter Link Converter

{
  "manifest_version": 2,
  "name": "FxTwitter Link Converter",
  "version": "1.1.3",
  "description": "Replaces x.com or twitter.com with a user-selected domain when sharing tweets.",
  "icons": {
    "48": "icons/fixtwitter_icon.png"
  },
  "permissions": [
    "clipboardWrite"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://x.com/*",
        "*://twitter.com/*"
      ],
      "js": [
        "link-replacer.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fa020d8c-761e-4846-9c02-97231a91ac0d}"
    }
  }
}