Examine source code of Adless 5eTools

{
  "manifest_version": 2,
  "name": "Adless 5eTools",
  "version": "0.0.2",
  "author": "Gahtao",
  "description": "Removes ad nodes from 5e.tools.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://5e.tools/*"
      ],
      "js": [
        "no-ad-5e-tools.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{55eea323-e72e-4e90-ad54-2f468947e9ac}"
    }
  }
}