Mozilla Firefox and Google Chrome are the web browsers we utilize primarily in the development of our websites as they adhere to international standards, while IE does not adhere to such standards. Both Firefox and Chrome are open source applications and in alignment with our philosophy in supporting the open source community. In general Firefox and Google Chrome tend to be more secure and simply faster at rendering webpages.
If you do a google search for 'Drupal problems in IE' you will see a plethora of issues ranging from broken CSS style sheets, to certain modules not being supported and limitations like; only being able to load no more than 31 style sheets in IE. These are just a few examples of why we highly recommend the use of either Google Chrome or Mozilla Firefox over Internet Explorer when administering the content of your Drupal website.