Hi,
since I installed the nbextensions extension I can’t open Jupyter Lab in Chrome. It opens Safari. I tried to modify the jupyter_notebook_config.py file by changing c.NotebookApp.browser = '/Applications/Google Chrome.app %s' .
Can we back up and talk about the possible cause of the issue or what triggered it? (Most of your post seems to be about dealing with a symptom.)
Can you specify exactly what you mean by that extension? Like the full name or a link? If it is what I think it is, then you shouldn’t need it unless you are using a really old JupyterLab version. In other words, you may be taking chances installing incorrect software and it looks like in this case that messed up something you had working? Assuming it was opening in the correct browser in the first place.