I'm running Firefox 1.5rc2 on Mac OS X 10.4.3. I have had several spontaneous crashes of Firefox in the last few days. I had the same problem with 1.0.7. I've tried to determine if there is any pattern to the actions that cause the program to crash, but have not been able to determine what they might be. (By "crash", I mean that the little rainbow circle that indicates the application is "thinking" comes up and won't go away. When I Option+Command+Esc, the system tells me that FF is "not responding".) So far, I have had the crash occur when I tried to close an high-resolution image, when I tried to fill in a form on a website, and when I have tired to click on a link. I can't seem to find any use of Java, Flash, etc. that seems consistently correlated with the behavior. As fas as I can tell, this started with the update to 10.4.3. At least, I wasn't having these crashes in FF until about 10 days ago when I updated. Anyone else having a similar problem? Workarounds?