I'm having this same problem with my netbook running with FireFox, but with Internet Explorer that "Feature" section works fine. Don't know if it's a Java update that cause this. The odd part about that is, my desktop has the same exact add-on and there is nothing wrong with the site in both FireFox and Internet Explorer.
For my netbook, I've tried the following and they all don't work
-Disable all-add ons
-Tried in Firefox safemode
-Create a new profile
-Uninstall flash, and update the latest flash
-Clear all history with CCleaner, but that don't matter as I've set FF to clear all data every time FF closes.