Examine source code of Chatterino Native Host

{
  "$schema": "https://json.schemastore.org/chrome-manifest",
  "name": "Chatterino Native Host",
  "version": "1.8",
  "description": "Replaces the chat on Twitch.tv with Chatterino.",
  "permissions": [
    "tabs",
    "nativeMessaging",
    "storage"
  ],
  "host_permissions": [
    "*://*.twitch.tv/*"
  ],
  "icons": {
    "256": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "chatterino_native@chatterino.com",
      "strict_min_version": "109.0"
    }
  },
  "manifest_version": 3,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "https://www.twitch.tv/*"
      ],
      "js": [
        "inject.js"
      ]
    }
  ]
}