Examine source code of NextChapter

{
  "manifest_version": 2,
  "name": "NextChapter",
  "description": "Track your manga reading progress, resume chapters, and earn trophies — across all MangaVerse-powered sites. 100% local, no account needed.",
  "version": "1.1.1",
  "short_name": "NextChapter",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "homepage_url": "https://nextchapter.ai.studio",
  "author": "support@nextchapter.app",
  "permissions": [
    "storage",
    "scripting",
    "activeTab",
    "unlimitedStorage",
    "*://*/*"
  ],
  "options_ui": {
    "open_in_tab": false,
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "nextchapter@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "content_security_policy": "script-src 'self'; object-src 'none'; base-uri 'none';",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "NextChapter"
  },
  "sidebar_action": {
    "default_panel": "sidepanel.html",
    "default_title": "NextChapter"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}