Use openwebui with ollama.

Openwebui is compatible with the firefox sidebar.

So grab ollama and your prefered model.

Install openwebui.

Connect openwebui to ollama

Then in firwdox open about:config

And set browser.ml.chat.provider to your local openwebui instance

Google suggests the you might also need to set browser.ml.chat.hideLocalhost to false. But i dont remember having to do that