With more companies adopting security practices such as web proxies, blocking broad Internet access, removing administrator privileges to user desktops & laptops, browser security receives less of an emphasis that feature functionality. In general, corporate IT staff are not tasked by their management to make sure a user's browser works well with Yahoo! or MSN Groups or even Slashdot. They are tasked to ensure the user's browser works with the myriad of applications that the managers expect the users to use throughout his/her work day.

When faced with internal corporate applications, there are still some that do not work well with Firefox. Through no fault of the browser, the corporate web application could be designed specifically with IE in mind and, hence, doesn't work as well with Firefox. In order for Firefox to obtain a larger marketplace within corporate infrastructures, there needs to be significant uptake by the companies designing internal corporate web applications.