Firefox Blink or Quick Screen Flash

On common websites such as Facebook and Yahoo! (for example) and many other not so common ones the Firefox browser window will flash or blink briefly. At least for me this happens quite frequently, while performing what I would consider to be pretty basic, normal browsing activities. I might have perhaps anywhere from to 3 - 15 tabs open with no video, no animation, with pretty basic text and pictures.
The blink or flash is almost like a popup window was trying to load but failed to appear although there is no notice of any kind. This is not a repetitive blinking but is more of a very quick flash or screen blink. It is not the monitor. It only seems to only happen once or twice and then will take a bit of a "break", perhaps a few seconds to a few minutes then it will happen again or it may not. For some reason it does seem to happen the most frequently on Facebook but it is not limited to Facebook.
I am currently on build 28.0 of Firefox and Firefox says it is currently up to date. Under Tools > Advanced > General Browsing > Use hardware acceleration when available; is currently unchecked. I have searched through the other threads that have dealt with other “blinking issues” and have tried the solutions there to no avail. I have gone through 'safe mode' and a restart and it has not seemed to work. If it matters I am currently using Windows 7 Professional, 64 bit. I do use Norton 360 as well.
This issue has only appeared possibly with in the last three builds or so and has not ever happened ever before. Does anyone have any suggestions or a fix suggestion? I really dislike Chrome, but may have to switch as this is getting pretty annoying.

Moses, I think perhaps we "might" be on to something. I did run all the pieces of software you suggested, except for the last one as that one required some sort of registration. I figured by the time I did partial and complete scans with all the others I was possibly fairly safe to skip the last one.
I know each user and issue can be slightly different, but I will share my results and my processes in an effort that it may help someone else.
Microsoft Safety Scanner - the Quick Scan Turned up No Results. However a Full System Scan after 2 1/2 hours and 2.5 Million files later turned up 2 files one of which seemed to be automatically cleaned and the other is what ''may'' be the culprit is called ''''Exploit:Win32/APSB08-11.gen!A''''
The software automatically removed the Malware. By clicking on the file you can get a report about the file and what it does. This file evidently effects Adobe Flash software. After the removal I made sure I updated the Adobe Flash software like Microsoft suggested.
The other pieces of software that you recommended MalwareBytes' Anti-Malware, TDSSKiller - AntiRootkit Utility, Hitman Pro, ESET Online Scanner fortunately yielded nothing but a few tracking cookies and an old pesky 'Ask Toolbar' that will not seem to go away. All of which I was able delete.
I will let you know if the problem persists or if this as I suspect may have solved the issue.
Interesting how you think are protected by scanning and updating definitions everyday but still something can still get by.

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Lets try again.
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Firefox Blink or Quick Screen Flash

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