Examine source code of Sample Tab Audio

{
  "icons": {
    "16": "icon16.plasmo.2577fc03.png",
    "32": "icon32.plasmo.d583dc1e.png",
    "48": "icon48.plasmo.e0fcfb1d.png",
    "64": "icon64.plasmo.e6259081.png",
    "128": "icon128.plasmo.96a1ede9.png"
  },
  "manifest_version": 3,
  "action": {
    "default_icon": {
      "16": "icon16.plasmo.2577fc03.png",
      "32": "icon32.plasmo.d583dc1e.png",
      "48": "icon48.plasmo.e0fcfb1d.png",
      "64": "icon64.plasmo.e6259081.png",
      "128": "icon128.plasmo.96a1ede9.png"
    },
    "default_popup": "popup.html"
  },
  "version": "0.3.0",
  "author": "ExtensionGurus <hello@extensiongurus.com>",
  "name": "Sample Tab Audio",
  "description": "An extension that enables audio capture, preview and download from the browser's current tab",
  "background": {
    "scripts": [
      "static/background/index.js"
    ]
  },
  "permissions": [
    "storage",
    "activeTab",
    "downloads"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contents.a5b44d35.js"
      ],
      "all_frames": false,
      "css": []
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9847a89a-591d-4e79-a0e2-6004e8505510}"
    }
  }
}