Gamepad to Keyboard Mapper

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Gamepad to Keyboard Mapper",
  "version": "1.0.1",
  "manifest_version": 3,
  "description": "Map gamepad buttons and axes to keyboard keys",
  "homepage_url": "https://game103.net",
  "action": {
    "default_title": "Gamepad to Keyboard Mapper",
    "default_popup": "popup.html"
  },
  "host_permissions": [
    "*://*/*"
  ],
  "permissions": [
    "storage",
    "debugger"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "background": {
    "service_worker": "background.js"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon32.png",
    "138": "icon128.png"
  }
}