Examine source code of Flat.io Slider Toggle

{
  "manifest_version": 3,
  "name": "Flat.io Slider Toggle",
  "version": "1.0.3",
  "icons": {
    "128": "icons/icon-128.png"
  },
  "host_permissions": [
    "https://flat.io/embed/*",
    "https://*.flat.io/embed/*",
    "https://flat-embed.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://flat.io/embed/*",
        "https://*.flat.io/embed/*",
        "https://flat-embed.com/*"
      ],
      "all_frames": true,
      "js": [
        "content/inject.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "content/injected.js"
      ],
      "matches": [
        "https://flat.io/*",
        "https://*.flat.io/*",
        "https://flat-embed.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "flat-io-extension@martijnc.be"
    }
  }
}