Using either version 6 or 7 on OSX 10.6.8 the browser will randomly 'hang' for ten to twenty seconds and become unresponsive. If clicking is attempted you get the spinning beachball of death. If you check the system activity monitor, it can be seen that Firefox is taking up to 100% of the processor time dring this hang. It also says that 'Firefox is not responding'. After the hang everything goes back to normal. This is annoying beyond the call of duty. I have started to use Safari and Chrome due to this hanging. In fact it has just happened while I have been typing this and tried to use the text window scroll bar! I have gone back to version 6 and it still happens.