Hmm... I hit "Post Reply" and posted a reply.
Got directed to the ad page after submitting the post, no redirect, and a broken 'if you aren't redirected, click here' link...
I then retype "gfy.com" in my address bar only to come back and realize that my submitted post was never posted.
using the latest version of Firefox and all of my addons are available through mozilla.com.
Hope that helps in the trouble-shooting... because that seems like trouble.