Unable to download mar file from VSE console using Firefox

Document ID : KB000124996
Last Modified Date : 21/01/2019
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While trying to download a .mar file from the Portal console  in Firefox,  I am getting  an Undefined file message.   The downloaded file is of type 'Undefined'  and saved to   /Dowloads/undefined.  


All DevTest supported versions
Probably caused by an extension, theme, or plugin in Firefox. 
  1. Swtich to Chrome or IE browser. 
  2. Using Chrome you are able to now download the .mar files.
  3. Rename the .mar file to a .zip file using a command prompt to view the content.