Examine source code of AutoCrate

{
  "manifest_version": 3,
  "name": "AutoCrate by BeatHub",
  "version": "1.2.1",
  "description": "Auto-play Splice and LANDR samples. Crate-dig while you do anything else.",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://splice.com/*",
    "https://samples.landr.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://splice.com/sounds**"
      ],
      "js": [
        "splice.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://samples.landr.com/**"
      ],
      "js": [
        "landr.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "contact@beathub.co"
    }
  }
}