ESC to switch to Command Mode not working - Firefox on MacOS

Hi,

Previously, when in a Notebook cell, I could use the “ESC” key to switch from Edit mode to Command mode. Now, maybe after a Firefox update, this no longer works. The ESC keypress just doesn’t seem to do anything at all.

I’m using Jupyterhub + Jupyterlab, and in the Settings pane (screenshot) I added “command+ESC” as a keyboard shortcut to enter Command Mode. This WORKS. Yet just ESC alone does NOT work.

I would appreciate any tips on how to debug/proceed.

[Edit: tried disabling all extensions, that had no effect.]

[Edit: I downloaded Firefox 153.0 and ESC works. Ugh.]

[Edit: I downloaded Firefox 154.0b7 beta and ESC works again… so maybe I just need to wait for 154 to be released…]

Thank you,
dustin

Jupyterlab 4.5.7
Notebook 7.5.6 (in Jupyterlab, if I “Open in Jupyter Notebook”, I get the same behavior)
Firefox 153.0.3 (works in Chrome, ugh)
MacOS Sequoia 15.7.7

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