Thank you for the additional information.
We do not have a graphic editing control and for the time being we do not plan to implement such a tool.
Telerik develop only cross browser controls and could not provide a solution for Mozilla based browsers only.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items