manifest.json

{
  "manifest_version": 3,
  "name": "XTheme Engine",
  "version": "1.0.0",
  "description": "Customize Twitter/X interface colors",
  "permissions": ["storage"],
  "host_permissions": ["https://x.com/*", "https://twitter.com/*"],
  "background": {
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": ["https://x.com/*", "https://twitter.com/*"],
      "js": ["content/inject.js"],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "XTheme Engine"
  }
}