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Enabling Pop Up Blocking does not remain selected when restarting FF4 next time.. XP Pro

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I enable 'block pop up windows' but next time I start FF4 it is not enabled. (Pop up window comes along and I check and yep, it's un-checked again!)

I enable 'block pop up windows' but next time I start FF4 it is not enabled. (Pop up window comes along and I check and yep, it's un-checked again!)

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