Examine source code of JW Text Marker

{
  "manifest_version": 3,
  "name": "JW Text Marker",
  "version": "3.20",
  "description": "A tool for publishers to create custom text markers, allowing to quickly jump straight to specific paragraphs.",
  "content_scripts": [
    {
      "matches": [
        "*://www.jw.org/*"
      ],
      "js": [
        "textMarker.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "textMarver_v3_20@jwpubs.org"
    }
  }
}