After Thunderbirdupdate RGB-Value Picker in Thunderbirdwindows

Hello,

xubuntu 16 did the last days an update of some packages one of the packages was thunderbird.

After the update I got in every thunderbird Window, menue, bubblehelp a pink view that shows
three values from 0-100 depends on the mouseposition, I think its a colorpicker.

I never installed a colorpicker for thunderbird, it seems that this is a fragment from the developers.

How can I disable this colorpicker or is there another update in the pipeline that comes without this anoying thing?