Examine source code of HN comments blocker

{
  "manifest_version": 2,
  "name": "HN comments blocker",
  "version": "1.1resigned1",
  "description": "Blocks the comment section of all HN posts where you haven't visited the submitted page url",
  "icons": {
    "48": "icons/icon.png"
  },
  "background": {
    "scripts": [
      "historySearch.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://news.ycombinator.com/*"
      ],
      "js": [
        "blockComments.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "history"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{123bead6-4ee3-4815-a998-f7ca991d7fa6}"
    }
  }
}