Incorrect. It's the web server's purpose to serve web applications. The browser's purpose is to act as the client, the user's agent, in rendering those web applications. If you're using Firefox, you've probably already got LLMs (well, NMT models which are built using large language corpora, and among other things, a transformer architecture, so close enough) and they're a good thing because they allow you to translate websites without sending that site and its address and content to a third party for remote translation and surveillance.