There are four commonly-used internet browsers out there right now; Microsoft Internet Explorer, Mozilla Firefox, Google Chrome, and Apple Safari. Please be aware that they all do the same exact thing...show you the Internet. The differences between them lies in how each one of them handles the rendering of web pages. As of right now, the following browsers tend to work better for the following applications you may be using.
Internet Explorer - Novus and Microsoft Outlook Web Access
Firefox - PowerSchool/PowerTeacher
Chrome - Google Apps...specifically Google Drive (Docs)
Please be aware that browsers update frequently and you may need to adapt your internet browser use based upon that.