Examine source code of dimar

{
  "manifest_version": 2,
  "name": "dimar",
  "version": "1.0",
  "description": "Refreshes DIM automatically every few minutes",
  "content_scripts": [
    {
      "matches": [
        "*://app.destinyitemmanager.com/*"
      ],
      "js": [
        "dimar.js"
      ]
    }
  ]
}