Examine source code of Gumroad Video Scraper

{
  "manifest_version": 2,
  "name": "Gumroad Video Scraper",
  "version": "1.1",
  "description": "Opens first found jwplayer or yt embed in another tab on gumroad.com. Hit the button to run.",
  "icons": {
    "48": "arrow-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.gumroad.com/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3bc77599-80a9-4b29-ab88-6e09b9cbb11d}"
    }
  }
}