Well, That is something which could be explored more. Coz IE and Forefox are two most widely used. Though IE version comes after gap firefox development is more quick after every 6-12 months cycle.It would have been great to come up with tool which will verify the website compatibility and check if IE/firefox is more compatible.
But I do welcome developers/sysadmin/Consultants to drop their interest and suggestions.
Special Invitations to Moderators at the end