Examine source code of Clover IDT Extension

{
  "manifest_version": 2,
  "name": "Clover Workfront Extension",
  "description": "",
  "version": "0.29",
  "icons": {
    "16": "clover16.png",
    "48": "clover48.png",
    "128": "clover128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.workfront.com/*"
      ],
      "css": [
        "content.css"
      ],
      "js": [
        "vendor.js",
        "content_start.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "vendor.js",
    "content.js"
  ],
  "permissions": []
}