Screen has little boxes all over, uninstalled and reinstalled but boxes are still there. This is only program with this problem.

When I opened Firefox this A.M the screen came up with little boxes, in columns, covering the whole screen. Four of the columns are colored in like a cash register tape that is running out of paper. I uninstalled Firefox and reinstalled it with no change. This is the only program on this computer that this is happening with. Please advise.
Thank you,
Phil

This can be a problem with the font that is used to display the text.
You can use this extension to see which fonts are used for text that is selected (right-click context menu: Show fonts in selection).
*fontinfo: https://addons.mozilla.org/firefox/addon/fontinfo/
You can do a font test to see if you can identify corrupted font(s).
*http://browserspy.dk/fonts-flash.php?detail=1
You can try different default fonts and temporarily disable website fonts to test the selected default font.
*Tools > Options > Content : Fonts & Colors > Advanced
*[ ] "Allow pages to choose their own fonts, instead of my selections above"

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