Please try it again. In the last few weeks we've made some changes that drastically sped up things in Firefox, and we have plans for more changes in the pipelin

Please try it again. In the last few weeks we've made some changes that drastically sped up things in Firefox, and we have plans for more changes in the pipeline. See https://github.com/jupyterlab/jupyterlab/pull/3805 https://github.com/jupyterlab/jupyterlab/pull/3805 and https://github.com/jupyterlab/jupyterlab/pull/3802 https://github.com/jupyterlab/jupyterlab/pull/3802 for more details.