Exporting a Skuid Excel Template working in Chrome/IE but not Firefox - the problem I believe is the

This problem posted 2 years ago was not answered and I found that I am having the same problem.  I found that when I enter a Export Options - Custom File Name Firefox is unable to open a file originating from a table in Excel.  I have customers that insist on using Firefox instead of using IE 11 or Chrome.  Our Chrome is locked down and allows only the minimum capability. 

Through trial and error I found when the Export Options - Custom File Name blank, Firefox is able to open the csv file using the MS Excel.  However, when I populate the Export Options - Custom File Name and then try to export, Firefox cannot open with Excel, but instead requests the user browse for an application to open the file. 

What version of Skuid are you using?