The p's and b's in the above image are strange, relative to the other letters. They are more-bold or stretched a bit horizontally. This is viewing wikipedia in firefox on windows 7. Even the text on serverfault appears this way... some letters appear almost bold because they get stretched horizontally a bit.
This is a completely default installation of Windows 7 and Firefox... really don't know what's going on here.
What's going on here and how can I fix it? This is very annoying to me.