Examine source code of ThingiverseNextPageButton

{
  "manifest_version": 2,
  "name": "ThingiversPaginantion",
  "version": "1.0",
  "description": "Go to the next thinigvers search page",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.thingiverse.com/newest*"
      ],
      "js": [
        "code.js"
      ]
    }
  ]
}