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The date range selector UI component seems to have a bug in Firefox. To reproduce, click on the date range selector to popup the calendar view. Starting with Period radio buttons set to "Day", select the "Date range" radio button. Then select the "Day" radio button again (without actually selecting any dates from the calendars). The UI will then sit spinning "Loading data..." for ever.
(In ) fixes #3026 firefox doesn't reload page if url doesn't change when setting it with location.href - now a location.reload is done
Thanks for looking into this bug!