Examine source code of FA page Blocker

{
  "manifest_version": 2,
  "name": "FA page Blocker",
  "version": "1.0",
  "description": "blocks some user pages of fa",
  "content_scripts": [
    {
      "matches": [
        "*://*.furaffinity.net/*"
      ],
      "js": [
        "fapb.js"
      ]
    }
  ]
}