Examine source code of UrlReplacer

{
  "manifest_version": 2,
  "name": "UrlReplacer",
  "version": "1.1",
  "description": "Checks the current Url and replaces it if a rule for this site is defined.",
  "icons": {
    "32": "icons/find_and_replace_svg_enabled.svg",
    "48": "icons/find_and_replace_svg_enabled.svg",
    "64": "icons/find_and_replace_svg_enabled.svg",
    "96": "icons/find_and_replace_svg_enabled.svg"
  },
  "permissions": [
    "activeTab",
    "management"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.mozilla.org/*",
        "*://docs.microsoft.com/*",
        "*://learn.microsoft.com/*",
        "*://www.youtube.com/*"
      ],
      "js": [
        "content_scripts/urlReplacer.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "extensionBase.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/find_and_replace_svg_enabled.svg",
    "default_title": "urlReplacer",
    "default_popup": "popup/urlReplacerDialog.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9167acab-25db-4403-b13b-a6be4d06acea}"
    }
  }
}