Thank you for sending us your feedback, it is always much appreciated.
We have decided to design a screen where it will be possible to configure the tools you want to be available for the editor. You will be able to add all tools, the way they are here for example:http://www.telerik.com/demos/aspnet/Editor/Examples/Default/DefaultCS.aspx
Yes, you are right that the Image control should allow for browsing images. This will be fixed for the next release.
Unfortunately, we haven't tested extensively how Sitefintiy beta behaves under
Firefox, but it has become a priority now. Since the second build of beta version (that of Tuesday) there is a lot of improvement as regards to the CSS. We believe that things will be a lot tidier in the
As for the error that you get, can you please give us more details, such as when exactly do you get it, which page, is it only in administration or in public mode too.
All the best,