Umbrel GUI is messed up in Firefox

Had an internet outage this morning, and after contacting my provider and getting back online I see no app icons on the welcome screen. The Storage and Ram indicators show 0 MB. The CPU still looks to be running at 69 Degrees (see other thread in forum about this bug) and I received a warning that my SD card was failing. This was in Firefox.Then I ran a log and found out that apps were running OK, I switched browser - and the GUI would now show me the app icons and correct settings.
Below is how the Umbrel welcome page still looks in Firefox. No app icons. Why is the Umbrel GUI so messed up?

Got the GUI back in Firefox by clearing the cache. I wonder what happened here?