FF 3.5 and JS_GC Crashes

Hello:

I have written an extension that analyzes the performance of our
company's multi-tier Web application. It inspects client-side behavior
(it has a builtin JavaScript profiler and analyzes HTTP resource
loading) as well as tracks backend delays (that contributes to end-to-
end performance).

The extension uses nsIWebProgressListener and jsdIDebuggerService APIs
extensively. It also features a C++ XPCOM (to monitor browser process
CPU usage) and an JavaScript XPCOM component.

We are finding many crashes associated with Firefox 3.5 that we are
not seeing with FF 3.0.x. The debug stacks seem to indicate failures
in JS_GC and other JavaScript related APIs.

Has anyone observed similar problems with the use of these APIs and FF
3.5?

Does anyone have any suggestions for diagnosing the source of problems
related to GC corruption? Or perhaps suggestions for coding that
prevents these types of problems?

Thanks,
Glenn