Comment 4 for bug 234169

I've experienced the exact same problem. However, I don't and haven't ever had the IcedTea plugin installed. If it helps, I have a few extensions installed: Flashblock, the StumbleUpon toolbar, and user agent switcher. The behavior happens about 1 in 6 times I run Firefox, and will always lead to a crash within a few minutes if the blank window is closed. The windows usually seem to pop up early in a runtime, often within the first few pages that are loaded. It doesn't seem to crash, though, if the blank window(s) are not closed. I've never caught firefox's stderr output when the behavior occurs, though. This has occurred in both the beta 5 that first shipped in Hardy, and in the new presumably-rc1 version that was pushed in an update.