Examine source code of Degenderer

{
  "manifest_version": 2,
  "name": "Degenderer",
  "description": "Replaces *_: in gendered words.",
  "version": "1.0",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./degenderer.js"
      ]
    }
  ]
}