I'm using Mac OS 10.6.8 with Firefox 7.0.1. In the past hour or so my fonts on nearly all webpages have turn to a bold san serif font and I can't figure out how to change them back to a thinner font. Can anyone help?

This just happened without reason. Not sure what other information I can provide.

Hi! It sounds like you might have accidentally changed the default font. You should take a look at the Knowledge Base article [[Changing fonts and colors#os=mac&browser=fx7]]. It should give you all the steps you need to change it back. Another possible scenario is that you accidentally increased the font size. This might give the appearance that all the text is in bold. You can find the details in [[How do I use Zoom?]] Since this can be done through a keyboard shortcut, it might be worth a look. I know I've accidentally changed the font size myself a few times.
Hopefully this helps!

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