Examine source code of input-field

{
  "manifest_version": 2,
  "name": "input-field",
  "version": "1.0",
  "description": "Adds input field to the 2D world of rC3",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://test.visit.at.wa-test.rc3.cccv.de/*",
        "*://*.at.rc3.world/*"
      ],
      "js": [
        "input-field.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "input-field@galaxy.builders"
    }
  }
}