Sites that make Firefox sad. #break# list of sites that actively block browsers other than Internet Explorer or have some serious problem that prevents the site from being usable in Firefox. #break# This is by no means a complete list, there are far too many sites that only work properly in IE for one dumb reason or another. And many of the worst offending pages are buried deep inside sites, inside password protected areas, or on intranets. #break# Web designers or people purchasing web based products, especially for businesses, have to be really rock stupid or insane to discriminate against popular browsers such as Firefox, Opera, or Safari. #break# As of this writing it is not uncommon, depending on type of site, to have 5%-25% of visitors use something besides IE.