Include Content - Problems with older Firefox (disturbed dialog)

[Former user]

I have installed version 2.5.5 of include content in a confluence 6.10. With my Firefox Version 52.9 it work very well, but all company users with an older Firefox ESR 45.9 have an problem if they try to move an page over move menu point. Normaly there should be open te move dialog but it isn't there.

[Scott Selberg]

I can't reproduce the problem.