What are those strange boxes and how do I get rid of them?

In my yahoo mail, all the navigation buttons are now little boxes with 4 letters/numbers: EO/55, EO/0$. (/ = newline) I have the latest version of Firefox 31.0, running Mac OS x 10.9.4. Any suggestions?

Oops, that went wrong in my answer above, and it was indeed the solution I wanted to promote this issue is on the fonts and colors not.

Tags: Firefox

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