I was closing a window from http://www.myfreecams.com/ (NSFW) that had a video going, and Safari crashed. I was using the Safari 3.0.4 in Tiger on a MBP. I've only seen this once, but mitzpettel looked at the stack trace and asked me to file a bug.
Created attachment 19250 [details] stack trace Top of the stack is WebCore::RenderObject::setStyle, but perhaps more interesting is com.apple.audio.SoundManager calling CFRunLoopRun* in the middle of Safari tearing down the DOM.
A DOM timer is firing inside the inner run loop, causing re-entry into engine code.
<rdar://problem/6023627>
Mass closing plug-in bugs, as plug-in support has been removed from WebKit. Please comment and/or reopen if this still affects WebKit in some way.