Firefox doesn't display some text on certain pages.

I've noticed that on some pages, Firefox doesn't display certain text. I have the newest version of Firefox installed and my flash and java are updated. The text displays fine on Chrome and IE. Please see my example in the screenshots of the webpage. Does anybody know what I can do to fix this problem or if there is some sort of plugin I am missing to display certain content? Thanks.

Screenshot of Firefox: Screenshot of Chrome:

↓ Show more ↑ Show less
  • All posts
  • Helpful Solutions
  • post
  • owner
  • solution
  • owner