Error in Firefox when attempting to view dataset

I'm [user] on a computer running Windows 10 Enterprise (Version 10.0.17134, Build 17134).  When I use Firefox (version 60.5.0esr 64-bit) and I click on the dataset I want to examine, I get a pop-up saying "error in form/Toolbar.showDatasetExplorer: DatasetExplorer is not a constructor". However, everything works properly when I use Chrome (Version 71.0.3578.98 64-bit) on the same computer.