Examine source code of EveryDollarBoost

{
  "manifest_version": 2,
  "name": "EveryDollarBoost",
  "version": "1.0",
  "description": "Adds some helpful UI elements to the EveryDollar dashboard.",
  "icons": {},
  "content_scripts": [
    {
      "matches": [
        "*://*.everydollar.com/app/budget"
      ],
      "js": [
        "every_dollar_boost.js"
      ],
      "run_at": "document_end"
    }
  ]
}