Problems dragging full screen browser windows

[ant9985]

For a couple of weeks now, iv had this problem where ill have a firefox browser open full screen, and ill want to move it to my second monitor(i have two monitors). So ill move the mouse to the top, left click and hold then try and drag the window. Sometimes it moves fine, but often it fights against me going back to it's original full screen state(as soon as i pull it away from being full screen, it goes back to full screen again).

As you can imagine, this is quite irritating but not super important(I can just double click it to shrink the window and then move it that way). Just wondered if anyone had experienced this, or knows how to cure it?

Thanks.

System specs:
PSU: Corsair 850W TX Series
GPU: EVGA 470GTX
Mobo: Asus M4A89GTD PRO
Ram: 2x2GB G. Skill DDR3 1600mhz
CPU: AMD Phenom II X4 965 Black Edition
OS: Win 7 Home Premium x64(with latest updates)
Sound card: Auzentech Prelude
Harddrives: Seagate baracuda 320mb; Samsung 1TB 7,200rpm 32mb cache; WD My Book 1TB.
Optical drives: LG GGC-H20L Super Multi Blue Blu-ray Disc and HD DVD-Rom; LG-GH22NS30 22x Super multi.
Monitors: Dell UltraSharp U2412M 61cm (24''); Samsung SyncMaster 204B
Case: Antec900 Ultimate gamer

 

[BaalRoi]

I did have this but very few times, i'm not sure if it is related to watching recently movies in Full Screen, but as you said, i usually do the same thing when i notice the bug, i Hold on the LMB to pull the window to a smaller size and then drag it to the other monitor.