This is its own plugin in case you would like to disable this feature.
e.g. jupyter labextension disable @jupyterlab/docmanager-extension:open-browser-tab
Note: If disabling this, you may also want to disable:
@jupyterlab/filebrowser-extension:open-browser-tab
A plugin providing open-browser-tab commands.
This is its own plugin in case you would like to disable this feature. e.g. jupyter labextension disable @jupyterlab/docmanager-extension:open-browser-tab
Note: If disabling this, you may also want to disable: @jupyterlab/filebrowser-extension:open-browser-tab