Examine source code of Pokemon Fire Red

{
  "manifest_version": 2,
  "name": "__MSG_ext_name__",
  "version": "1.0.3",
  "description": "__MSG_ext_description__",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "firered@myemulator.game",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "16": "firered.png",
    "32": "firered.png",
    "48": "firered.png",
    "128": "firered.png"
  },
  "browser_action": {
    "default_title": "__MSG_action_title__",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "firered.png",
      "32": "firered.png",
      "48": "firered.png",
      "128": "firered.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "content_security_policy": "script-src 'self' 'wasm-unsafe-eval'; worker-src 'self'; object-src 'self';",
  "web_accessible_resources": [
    "emulatorjs/*",
    "emulatorjs/**/*",
    "emulator.html"
  ]
}