All I can think of is to accumulate as many details as we can give you of the crash reports.
Here is from attempting to go to Webgl.org from a Google search.
Problem Event Name: APPCRASH
Application Name: waterfox.exe
Application Version: 184.108.40.20616
Application Timestamp: 54519150
Fault Module Name: mozglue.dll
Fault Module Version: 220.127.116.1116
Fault Module Timestamp: 54518e74
Exception Code: c0000005
Exception Offset: 000000000000d2a1
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1033
Additional Information 1: 3c26
Additional Information 2: 3c26f2be14c1853e424c184d47177c16
Additional Information 3: ba67
Additional Information 4: ba674299905d94d3d37d454845efaf28
Windows 7, x64, all updates, Waterfox, Firefox, Sea Monkey installed.