This happens to me and to two friends of mine. So it's hardly a coincidence. I have done a fresh Windows 7 install (for other reasons) so I thought this problem (which I had since about version 8.0) would disappear. I was wrong. Firefox and plugins are updated: Firefox 13.0 Shockwave Flash 11.3 r300 GPU video drivers are also updated. I came across the "plugin-container.exe solution" but it didn't solve the problem. How to reproduce the bug. Visit Youtube and click on some video. Minimize Firefox. Wait some seconds. Next time you restore the window Firefox crashes, you have to kill plugin-container.exe from the task manager OR you have to restart the entire browser in case you've disabled the plugin container. The same bug should occur when having various tabs open and one of them is Youtube with a video playing. But also when Firefox has no focus and you have other windows on top of it (and a Flash video running or even paused). Since this does happen: -with a fresh install; -with everything updated; -even disabling the plugin controller; it seems very very strange to me that this problem is STILL present since version 8.0 (or even before) and that there is so few reports of this bug around the internet. I'm not complaining here, I'm just showing my perplexity about almost noone having this bug which is ruining my (and my friends') Firefox experience since the past years. My purpose here is: * to let you know about this problem; * to know if other are experiencing it; * hopefully to keep giving support to this thread and answer to your questions about this bug so to help this thing being fixed;