Examine source code of Auto FXTwitter

{
  "manifest_version": 2,
  "name": "Auto FXTwitter",
  "version": "1.3",
  "description": "Will automatically convert all twitter links to fxtwitter for easier embeds.",
  "permissions": [
    "clipboardWrite",
    "clipboardRead",
    "contextMenus"
  ],
  "icons": {
    "48": "icons/fxtwitter-48.png",
    "96": "icons/fxtwitter-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*",
        "*://x.com/*"
      ],
      "js": [
        "auto_fxtwitter.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f5a28c59-13a5-4b63-b0be-408d0c72e8c1}"
    }
  }
}