Wow, this is looking good, I wish I had it available to me 6 months ago! Nice job :D I don't know if it's just me or not, but it's not working for me in Firef

Wow, this is looking good, I wish I had it available to me 6 months ago! Nice job :D I don't know if it's just me or not, but it's not working for me in Firefox (OSX Mavericks 10.9.1 and Firefox v26). The X's and checkmarks aren't showing up next to the highlighted selections. Works fine in Safari.