Examine source code of Word Replacer for Threads

{
  "manifest_version": 2,
  "name": "Word Replacer for Threads",
  "version": "1.11",
  "description": "Changes Words on Threads",
  "permissions": [
    "*://www.threads.net/*",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.threads.net/*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png",
    "default_title": "Threads Syphilis"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a1be5618-724e-4c80-9a9c-93543aa82637}"
    }
  }
}