Examine source code of GPT Auto Model Selector

{
  "manifest_version": 2,
  "name": "GPT-4 Auto Model Selector",
  "version": "4.0",
  "description": "Automatically appends /?model=gpt-4 to chat.openai.com",
  "author": "TherioJunior",
  "homepage_url": "https://gitlab.com/TherioJunior/ff-gpt4-autoselect",
  "icons": {
    "128": "icon/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://chat.openai.com/*"
      ],
      "js": [
        "src/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "src/pages/popup.html",
    "default_icon": {
      "128": "icon/icon128.png"
    }
  },
  "permissions": [
    "webNavigation",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e56e8dbb-3bb0-42bd-8094-83660dd3c68b}"
    }
  }
}