Examine source code of TDLoader Extension

{
  "manifest_version": 2,
  "name": "TDLoader Extension",
  "version": "1.0",
  "description": "TDLoader for steam.",
  "icons": {
    "48": "icmn.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://steamcommunity.com/sharedfiles/filedetails/*"
      ],
      "js": [
        "tdloader.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{db30abff-cbe5-412d-8b69-207ef138f33c}"
    }
  }
}