Can't get it running

[404LengiNotFound]

Amazing Idea of an Extension exactly what I need but

It is just not working for me tried everything
Installed it in the terminal with
jupyter labextension install @krassowski/jupyterlab_go_to_definition
Also tried installing it with the Extension Manager

It shows up in the Manager and in console

JupyterLab v2.1.4
Known labextensions:
app dir: /home/user/anaconda3/envs/AIenv/share/jupyter/lab
@krassowski/jupyterlab_go_to_definition v1.0.0 enabled OK

I use Firefox 81.0 (64-bit)

But It just doesn't work
I also tried all the alternative Shortcuts

[LqYe]

same issue. I've tried all shortcut combinations but it just doesn't work.

installed via extension manager
JupyterLab -- 2.2.9
Browser: chrome

[krassowski]

Do you happen to use Mac?