Examine source code of Vi Editing Mode

{
  "manifest_version": 3,
  "name": "Vi Editing Mode",
  "version": "0.0.11",
  "description": "Automatically and non-intrusively add a vi editing mode to all textareas/inputs. Behaviour is unchanged until you hit Escape.",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "vi.js"
      ]
    }
  ],
  "optional_permissions": [
    "clipboardRead",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0d4f406a-73d2-45c6-b25f-928f933d6178}"
    }
  }
}