Firefox 4 hangs when attempting to view the Applications tab in Preferences
Firefox 4 under MacOS X 10.6.6 hangs when I click to select the "Applications" tab on the Preferences dialog. It never paints the pane. When this happens, it consumes 60% CPU. Running dtruss against the running process shows a little activity, but not much.
I have tried deleting mimeTypes.rdf. It recreated a new, smaller one, but it made no difference to the problem. I have let Firefox continue to run for up to 10 minutes, with no change in responsiveness. I am forced to kill it every time. It is 100% reproducible on my system.
Firefox 4 under MacOS X 10.6.6 hangs when I click to select the "Applications" tab on the Preferences dialog. It never paints the pane. When this happens, it consumes 60% CPU. Running dtruss against the running process shows a little activity, but not much.
I have tried deleting mimeTypes.rdf. It recreated a new, smaller one, but it made no difference to the problem. I have let Firefox continue to run for up to 10 minutes, with no change in responsiveness. I am forced to kill it every time. It is 100% reproducible on my system.
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I just discovered that if I disable the Quicktime plugin (7.6.6), this problem goes away.