We are considering this issue as an important since it has a straight relation to effectively using RadEditor so that is why we have raised its priority. I could not give you an exact estimation when it would be resolved but I can assure you it is escalated to our development department and they will treat it as soon as they could. For the time being in order to overcome this obstacle please incorporate the following workaround:
Add the following script to your page:
Telerik.Web.UI.RadEditor.prototype._addHandlersForTextElements = function(selector)
Just make sure this workaround is placed after the script manager definition. Best place would be at the end of the page.
Depending on your page content you could override the following functions accordingly as well:
The only functionality that would be affected is managing form elements like Input and Select elements inside RadEditor content in Design mode with FireFox.
All the best,
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed