Buttons in .modal-footer not clickable in Windows Firefox when the modal is very long

Created by: roelgit

Using Firefox (latest, v44.0.2), it is not possible to click on the default modal buttons (down bellow) when the modal contains a lot of content, see an example: http://jsbin.com/tewizumipi/edit?html,output

In Google Chrome (latest, v49.0.2623.75 m) and Internet Explorer 11, there is no problem (the buttons are clickable) so i guess this is probably a browser (Firefox) bug? Tested under Windows 7 and 8.1.

Thanks!