I'm using Firefox on Windows.
Sort of related is that I'm finding is that the recommended shortcut, Ctrl-Shift-Period actually seems to activate Multi Account Containers, whose shortcut is set to Ctrl-Period (that must be the default, because I've never used shortcuts with this or changed them).
I'm not sure if this is a bug in Firefox or Multi Account Containers. (EDIT: seems to be a known issue with Multi Account Containers https://github.com/mozilla/multi-account-containers/issues/1963)
Firefox won't let us set our shortcut to "Ctrl-/" though? Is this a browser limitation?