Examine source code of Download.cpp

{
  "manifest_version": 2,
  "name": "Download.cpp",
  "version": "1.0.3",
  "description": "Adds a download button to CalPoly Pomona video players",
  "icons": {
    "48": "icons/icon@1x.png",
    "96": "icons/icon@2x.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.kaltura.com/browseandembed/*",
        "https://streaming.cpp.edu/media/*"
      ],
      "run_at": "document_idle",
      "js": [
        "src/inject.js"
      ],
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "src/cpp-dl.js"
  ]
}