Hi Maya.  We are being told by someone in the Infragistics Support Team that the "Ultra" grids and controls do not support FireFox at all. 

Interestingly, the reason we've been given is that FF itself doesn't support the "getAttribute" function, when in fact it does (all major browsers support this function). 

Our research suggests that the problem actually is that FF counts DOM nodes differently and blows up the control's javascript when it tries to USE the getAttribute function to search for attributes that simply don't exist because it's looking for attributes of TEXT nodes that do not exist. Text nodes have only 2 attributes, one being its "id", the other being its "type". A text node type is always 3, but there is no check in the javascript to see what type of node is being looked at, assuming that it is looking at a node containing the attribute of interest.

I posts this only to provide acurate information to others who may be pulling their hair out trying to figure this out on their own, as we did. I'm not sure this has a thing to do with the issue you are talking about, but it very well may, and I'm sure it will help others who are wanting to stay with their "Ultra" controls for one reason or another.

Thank you sincerely,

Hairless in West Chester, PA

Lee Roper - PrimePay, Inc.