Examine source code of YBW hide threads

{
  "manifest_version": 2,
  "name": "YBW Hide Threads",
  "version": "2.0.3",
  "description": "Hides specifed threads on the YBW.com forum",
  "author": "DaveRo",
  "applications": {
    "gecko": {
      "id": "ybw_hide_threads@davero.addons.mozilla.org"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://forums.ybw.com/forums/*"
      ],
      "js": [
        "YBW_hide_threads.user.js"
      ]
    }
  ],
  "run_at": "document_end"
}