question about firefox pop up blocker?

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i am using firefox and just started using it again and i tried to go and play a game a few minutes ago and it wouldn't really work, it said that there was a pop up blocker that was stopping it...and it said to just hold down alt and control but i tried that and i was just wondering how you take the pop up blocker off? like is there a way like other browsers, i remember allowing some websites to have pop up windows but i can't figure it out with firefox, so does anyone know how to help me with this? i would like to thank you for taking the time out of your day to come by and read and review my discussion and hopefully answer, i hope that you all have had a great day so far and that you have a great and safe evening today, thanks again for taking the time to come by...