Examine source code of Nepali Typing Extension

{
  "manifest_version": 3,
  "name": "Nepali Typing Extension",
  "version": "1.5.0",
  "description": "A Firefox extension to help with Nepali typing.",
  "icons": {
    "48": "img/icons/icon-48.png",
    "128": "img/icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "scripts/content.js"
      ]
    }
  ],
  "action": {
    "default_icon": "img/icons/icon-48.png",
    "default_popup": "popup.html",
    "default_title": "Toggle Nepali Typing"
  },
  "commands": {
    "toggle-feature": {
      "suggested_key": {
        "default": "Ctrl+Alt+N",
        "mac": "Command+Alt+N"
      },
      "description": "Toggle Nepali Typing (Ctrl+Alt+N or Command+Alt+N on Mac)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4062a83e-86b0-4f11-b542-47d1f31afd73}"
    }
  }
}