Hi Andrea,
No. MARS 5.2 only supports up to FWSM 3.1
And MARS 5.3 only supports FWSM 3.1.5
Please take a look for yourself at this document:
Supported and Interoperable Devices and Software for Cisco Security MARS Local Controller 4.2.x and 5.2.x
You can reach it via this link if you are logged into CCO:
http://www.cisco.com/en/US/partner/products/ps6241/products_device_support_table09186a0080467232.html
Hope this helps.
Best,
Paul