Examine source code of Get Clip

{
  "description": "Download Twitch clips right from their clip page",
  "manifest_version": 2,
  "name": "Get Clip",
  "version": "1.1.0",
  "icons": {
    "16": "assets/get-clip-logo-16.png",
    "48": "assets/get-clip-logo-48.png",
    "128": "assets/get-clip-logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.twitch.tv/*"
      ],
      "js": [
        "content_scripts/script.js"
      ]
    }
  ]
}