Examine source code of Ruto - XPath Finder

{
  "name": "Ruto - XPath Finder",
  "short_name": "Ruto",
  "author": "Koushik Chatterjee",
  "manifest_version": 2,
  "version": "6.0.1",
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "description": "Rūto brings the best XPath to you. We are striving hard to improve better performance and more new features",
  "homepage_url": "https://sites.google.com/testleaf.com/ruto",
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "windows": "Alt+R",
        "mac": "Alt+R",
        "linux": "Alt+R",
        "default": "Alt+R"
      },
      "description": "Opens popup.html"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ruto@testleaf.com",
      "strict_min_version": "60.0"
    }
  },
  "permissions": [
    "clipboardWrite",
    "<all_urls>",
    "tabs",
    "activeTab",
    "contextMenus",
    "storage",
    "notifications",
    "unlimitedStorage",
    "downloads",
    "downloads.open"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "logo/16.png",
    "48": "logo/48.png",
    "128": "logo/128.png"
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/jquery.min.js",
        "content/content.js",
        "content/getMethodOrVarText.js",
        "content/handleTable.js",
        "content/getCss.js",
        "content/search.js",
        "content/record.js"
      ],
      "css": [
        "content/style.css"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Ruto",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "option.html",
    "browser_style": false
  }
}