Hi.

I use Jupiter Notebook myself using Firefox. What happens when you try to run it? Is there any error message?

Hi. Thanks for the reply. Jupyter Notebook used to work just fine on my machine using Firefox, and then it just stopped working. It still works as usual with Chrome or Safari, but with Firefox, it just opens a web page but then does not populate it with anything, so there is nothing you can do with it except close it again. No error messages though, although in the terminal there is a message saying: A `_jupyter_server_extension_points` function was not found in notebook_shim. Instead, a `_jupyter_server_extension_paths` function was found and will be used for now. That's the only interesting message I see.