Examine source code of Link Quality Checker

{
  "manifest_version": 2,
  "name": "Link Quality Checker",
  "version": "1.0",
  "description": "Comprehensive link analysis tool for checking broken links, SEO, and URL validation",
  "permissions": [
    "activeTab",
    "storage",
    "<all_urls>",
    "contextMenus",
    "webRequest",
    "downloads"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_popup": "popup/popup.html",
    "default_title": "Link Checker"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{12e87b86-5752-4b74-8260-654d82928fee}"
    }
  }
}