Examine source code of UnHighlight

{
  "manifest_version": 2,
  "name": "UnHighlight",
  "version": "0.2",
  "description": "Strips ?highlight=... from URLs",
  "author": "Justin Bassett",
  "homepage_url": "https://github.com/Quincunx271/UnHighlight",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "unhighlight.js"
    ]
  }
}