Examine source code of UTM Finder

{
  "manifest_version": 2,
  "name": "UTM Finder",
  "version": "1.1",
  "description": "Marks all anchor tags with UTM params with 5px sloid yellow border!",
  "icons": {
    "48": "icons/tag-48.png",
    "96": "icons/tag-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "utmFinder.js"
      ]
    }
  ]
}