You kind of can already, I know this isn't what you mean, but you can connect to unix sockets via a native application. "Native messaging enables an extension

You kind of can already, I know this isn't what you mean, but you can connect to unix sockets via a native application. "Native messaging enables an extension to exchange messages with a native application, installed on the user's computer. The native messaging serves the extensions without additional accesses over the web." https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Native_messaging https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...