Examine source code of AI-Chats Width Slider

{
  "manifest_version": 2,
  "name": "AI Chats Width Slider",
  "version": "0.2.2.8",
  "description": "Adds a slider to modify the max-width on Claude.ai, Perplexity.ai, DuckDuckGo Chat and ChatGPT",
  "icons": {
    "48": "./icons/icon48.png",
    "128": "./icons/icon128.png"
  },
  "browser_action": {
    "default_icon": "./icons/icon.png",
    "default_popup": "popup.html",
    "default_title": "AI Chats Width Slider"
  },
  "content_scripts": [
    {
      "matches": [
        "*://claude.ai/*",
        "*://perplexity.ai/*",
        "*://www.perplexity.ai/*",
        "*://grok.com/*",
        "*://duckduckgo.com/*"
      ],
      "js": [
        "slider.js"
      ]
    },
    {
      "matches": [
        "*://chatgpt.com/*",
        "*://chat.openai.com/*"
      ],
      "js": [
        "chatgpt-slider.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "web_accessible_resources": [
    "welcome.html",
    "qr-code.jpg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ai-chat-width-slider@omnomnom.mailer.me"
    }
  }
}