If you can not see emoticons of facebook when you comment or chat so here is how to fix Firefox is not showing emoticons on Facebook.
Today when i open Facebook in Firefox, I can not see my emoticons when I’m using chat, comment, update status. Instead of emoticons, Firefox is showing me blank spaces all over Facebook. I have tried to clean all data, I have restarted it, and it doesn’t help. After 15 minutes search in Google.com, I found my solution is:
I restarted Firefox with add-ons disabled (Alt -> help menu-> restart with add-ons disabled -> restart in safe mode). Then logged into Facebook, and the smileys were visible again. Logged out, restarted Firefox, and they are still there, at least for now.
This worked for me as well !