IE Request Addon "Apple" when using Google GWT

Hello,

we have a strange effect on MSIE 11 in our Google GWT Project. At one point the IE ask to install an Addon "Apple" (siehe Screenshot). 

We have no clue, where this Addon come from. Any hints ?

Frank

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscribe@googlegroups.com.
To post to this group, send email to google-web-toolkit@googlegroups.com.
Visit this group at http://groups.google.com/group/google-web-toolkit.
For more options, visit https://groups.google.com/d/optout.