Examine source code of URLExtractor

{
  "manifest_version": 2,
  "name": "URLExtractor",
  "version": "1.0",
  "description": "Simple tool to extract urls from webpages.",
  "homepage_url": "https://iampsp.com",
  "icons": {
    "48": "icons/icon_48.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon_16.png",
      "32": "icons/icon_32.png",
      "64": "icons/icon_64.png"
    },
    "default_title": "My Youtube Downloader",
    "default_popup": "browseraction.html"
  },
  "developer": {
    "name": "Mostafa Shiraali",
    "url": "https://iampsp.com"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "U0ConNPoOYZelg8PBH2gab1UvcS0I00Y@iampsp",
      "strict_min_version": "128.0"
    }
  },
  "permissions": [
    "tabs",
    "activeTab",
    "webRequest",
    "<all_urls>"
  ]
}