I'm using Win 7 and Firefox Screen fills with horizontal lines,

Had no problems with previous versions of FF. I updated with FFv4 several weeks ago and have my browser screen continually being filled with horizontal lines. I can remove some of them by using the vertical scroll bar but they return when the display contains a lot of text. Sometimes when display is pictures or videos I am spared. This never occurred before FFv4. If a screen contains a few pictures and is engulfed in lines I can scroll it with my mouse and some pictures reappear but there are still lines over the rest of the display. I use an antivirus (BitDefender) and scan regularly. I also use Windows Defender for protection which was recommended by my AV manufacturer.
Sometimes of late I have noticed that when the display is no maximized the problem doesn't happen as often. I use a 19" monitor.
So far tonight while writing this note I haven't experienced a problem but the window is not set to max.

I had this problem as well. For me, the solution was to disable the two latest add-ons I had installed: Cooliris and HP Detect (I have a Pavilion dm1z). The issue with horizontal lines went away after restarting the browser.

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