Examine source code of goodautytper

{
  "manifest_version": 2,
  "name": "Autotyper",
  "version": "1.0.0",
  "description": "Types text into any field with human-like speed, burst variation and self-correcting typos.",
  "browser_specific_settings": {
    "gecko": {
      "id": "autotyper@jack.local",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "Autotyper",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon.svg",
      "32": "icons/icon.svg",
      "48": "icons/icon.svg",
      "96": "icons/icon.svg"
    }
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "commands": {
    "toggle-typing": {
      "suggested_key": {
        "default": "Alt+Shift+T",
        "mac": "MacCtrl+Shift+T"
      },
      "description": "Start / stop autotyping"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/clock.js",
        "content/listmode.js",
        "content/engine.js",
        "content/ui.js",
        "content/main.js"
      ],
      "run_at": "document_idle",
      "all_frames": true,
      "match_about_blank": true
    }
  ]
}