Firefox contenteditable with on focus Bug!

Firefox contenteditable with on focus Bug!

Hello everyone, 

Im developing something with jquery, I have a dynamic html table using the content editable class with an on focus event.

It works perfectly in Chrome and IE ( lol ), but in firefox there seems to be a major bug. 

When I Copy/Paste smth (w Firefox) in a dynamically created span the whole span is duplicated and the table expands abnormally.

Maybe someone came across the same issue. 

Any help would be much appreciated. 

Greeting,

GD