When hovering over Like in Facebook a bar pops up with icons to select the type of Like you're wanting. In this version of Firefox on Windows the bar pops up but is empty. If you run the mouse pointer along the bar, a tool tip will popup for each icon, so you can tell where to click for the type of Like you want, but the icons themselves do not show up.
I've tried this on more than one computer and the problem still exists.
I've tried running Firefox in Troubleshooting Mode and the problem goes away. Returning to regular mode causes the problem to return.
