Examine source code of hCaptchaCantSpell

{
  "manifest_version": 2,
  "name": "hCaptchaCantSpell",
  "version": "1.0",
  "description": "Fixes hCaptcha's terrible spelling.",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "spellcorrect.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ea187314-5585-4fd4-a6e3-78c28534789a}"
    }
  }
}