I noticed that when using Firefox version 145 the toolbars to edit a map are not there. When working with the same map logged into the same account in Edge or Chrome the toolbars are visible. A coworker with Firefox version 144 checked and they could see all the toolbars. They then updated Firefox to version 144 and were no longer able to see them. Based on this it seems that Map Viewer is currently not fully operational in the latest version of Firefox.
What I see using Firefox version 145

What I see in using Chrome
