Examine source code of Lobsters Unread Comments

{
  "name": "lobsters-unread-comments",
  "version": "2.0.0",
  "description": "Lobste.rs unread comments",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "https://lobste.rs/*"
      ],
      "js": [
        "main-script.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "icons": {
    "32": "unread32.png",
    "48": "unread48.png",
    "128": "unread128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{11fea029-68e6-4ba2-994b-bcb99ce92f1c}",
      "strict_min_version": "48.0"
    }
  }
}