Gnome Extensions on Ubuntu 24.04

I recently moved from Ubuntu 23.10 to Ubuntu 24.04 which is at gnome-shell 46. Almost none of the extensions I had been using work. I looked for a System Monitor for the panel and of the dozen or so I found, only 1 worked and it was minimal, not really sufficient.

Is there a System Monitor I missed, or a workaround for version 46?