Even with the growing popularity of cloud services, the need for running native applications still exists.
By using noVNC and TigerVNC, you can run native applications inside a Docker container and access them remotely using a web browser. Additionally, you can run your application on a server with more system resources than you might have available locally, which can provide increased flexibility when running large applications.
When you’re finished, you’ll be able to access Thunderbird from any device using just a web browser. Optionally, you’ll also be able to locally access the files from it using WebDAV. You’ll also have a fully self-contained Docker image that you can run anywhere.