manifest.json

{
    "manifest_version": 3,
    "name": "Custom Font Changer",
    "version": "1.2",
    "description": "Customize the font on webpages like ChatGPT.",
    "permissions": [
        "storage",
        "activeTab",
        "scripting",
        "https://www.googleapis.com/",
        "https://fonts.googleapis.com/"
    ],
    "host_permissions": ["<all_urls>"],
    "action": {
      "default_title": "Select Custom Font",
      "default_popup": "popup.html",
      "default_icon": {
        "16": "icons/icon16.png",
        "32": "icons/icon32.png",
        "48": "icons/icon48.png",
        "128": "icons/icon128.png"
      }
    },
    "background": {
      "service_worker": "background.js"
    },
    "content_scripts": [
      {
        "matches": ["https://chat.openai.com/*"],
        "js": ["content.js"],
        "run_at": "document_start"
      }
    ],
    "web_accessible_resources": [
      {
        "resources": ["config.ini"],
        "matches": ["<all_urls>"]
      }
    ]
  }