Using the Web-based Manager : System requirements
 
System requirements
The following web browsers are supported by FortiManager v4.0 MR3 Patch Release 7:
Internet Explorer versions 8 and 9
Firefox versions 15 and 16
Other web browsers may function correctly, but are not supported by Fortinet.
To minimize scrolling, the computer’s screen should have a resolution that is a minimum of 1280 x 1024 pixels.