At this time IBM have provided thi SPR#JALAA7VSRE APAR LO88282 about this issue without workaround .
This issue isn't affecting any other browser or later FF version so you can downgrade to FF44 or better , start using the ESR branch 38.7.
Update: ibm has published this technote with a workaround
http://www-01.ibm.com/support/docview.wss?uid=swg21978919