Mozilla keeps crashing

My Firefox keeps crashing, especially when there are multiple tabs open. I am running Vista 32bit on a Toshiba Satellite Laptop. The error code is as follows:

Problem signature
Problem Event Name: APPCRASH
Application Name: firefox.exe
Application Version: 1.9.0.3224
Application Timestamp: 49094c66
Fault Module Name: StackHash_6353
Fault Module Version: 6.0.6001.18000
Fault Module Timestamp: 4791a7a6
Exception Code: c0000374
Exception Offset: 000b015d
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 1033
Additional Information 1: 6353
Additional Information 2: 9a9affcb11122691099341178495fd90
Additional Information 3: 1c64
Additional Information 4: d7def8a984bc8fd4f04e8d7f026c4726

Extra information about the problem
Bucket ID: 1015948193