Examine source code of newrelic colors

{
  "manifest_version": 2,
  "name": "newrelic colors",
  "version": "1.1",
  "description": "Fix awful UI from newrelic. Use color on accounts so you know which place you are. Source https://github.com/gcbw/newrelic_colors",
  "icons": {
    "128": "favicon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.newrelic.com/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c5818799-0932-45e0-b37c-7f475d15043f}"
    }
  }
}