Computer Dell Vostro 1510 with 2 GB RAM Operating System: Windows XP with all service packs and updates Recently I installed/updated Firefox to the latest beta version. That went well. The following day, I booted the laptop and windows on the desktop blinked in and out and shrank in size. If I double clicked on the shrunken window it would open and I could do some input. As long as the mouse pointer was on that window I was fine. If the pointer strayed away from that window or I had to go to another open window, the the blinking and shrinking would re-start. I did check for viruses and malware and none were found. I have had this happen in the past with another beta version of FireFox and the only solution was to remove it. Firefox was never opened during the sessions.