DK5 is causing Firefox to freeze,Under Windows 7 Pro and Firefox 42 on a quad core desktop computer

DK5 compose new diary function is very buggy on my fast quadcore desktop running Win7 pro and Firefox 42. Can read stories okay. But this is about my fifth try over the past 15 minutes in composing a diary.  THe first several tries led to a total freeze in Firefox so I had to restart Firefox. Then I found I could not enter text anywhere.  Restarted. Then entered text where the headline is supposed to go but could not enter text in the story body until I clicked the [H] formatting button (which is why this is written in very large text).