Installed Firefox on Windows 7 but the menu and icons bar is full of little horizontal lines over the icons and menu bar..

I installed Firefox 21 on a new Windows 7 OS. The menu bar and the icon bar at the top of the windows is full of little horizontal lines. Sometimes there are more lines and sometime less lines. It makes the icons and the menu items almost impossible to see. So far it's only the Firefox screen that does this. The other programs I installed so far doesn't do this.
Any ideas?

Hello,
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!
Thank you.

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