For some reason, then I set the MIME type text/html's defualt application, every protocol related to viewing documents (e.g. man) including the http and https tries to open in Mozilla. This is a problem since some are protocols that Mozilla does not support.
It seems to me that the run dialog, konquorer and any other app that executes the URL instead of opens it should not use the io slave for that protocol to determin the app to open (since I have had times where giving the run dialog a URL has opened Kwrite because the file it pointed to was of the text/plain MIME type) but by a protocol associate setting.