Examine source code of Hypertext HTML Block

{
  "manifest_version": 2,
  "name": "Hypertext HTML Blocker",
  "version": "2",
  "description": "The internet is plagued by the disease of webpages. These provide no utility, only serving as a vessel for capitalism. Webpages' only purpose is to exploit their users for monetary gain, whether that be by showing them ads, selling their data, or mining bitcoin on their machines. This extension blocks all webpages, allowing Firefox to realise its true potential as a PDF viewer.",
  "icons": {
    "48": "icons/blocker-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "blocker.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "58.0",
      "id": "{17e8c9c8-6dbf-4d75-9da2-2748cc35511c}"
    }
  }
}