Hello Ahmed,

What firefox version that you used. In Firefox, you should be able to navigate the cell much like IE. When inside editable mode, you could not just navigate just using keyboard.

We have behaviour when using arrow within edit mode, it will navigate in the editted text inside, not to navigate through into other cell. Also, in our documentation, it does not mean for edit mode.

If you want to have that scenario, you should hanlde it by yourself. We have clientside event OnEditKeyDown. You need to validate keyCode for the arrow. If it is valid, just navigate moving to next cell by calling ExitEdit() first.

Regards,
Handy