Examine source code of dk-sort

{
  "manifest_version": 3,
  "name": "dk-sort",
  "version": "0.3",
  "description": "Add sort toolbar to in dailykos.com live update articles.",
  "author": "Paul Duncan",
  "homepage_url": "https://github.com/pablotron/dk-sort",
  "browser_specific_settings": {
    "gecko": {
      "id": "dk-sort@pablotron.org",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "48": "icons/sort-numeric-down-48.png",
    "128": "icons/sort-numeric-down-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.dailykos.com/*"
      ],
      "js": [
        "dk-sort.js"
      ]
    }
  ]
}