@daath I get similar to what Fenrir got above, only I do get a single row of smilies that goes off the right side of the screen.
The problem I'm having is that there's no way to "back out" of that screen once it's engaged.
I tried the back button on the phone, the back option in the browser, neither got rid of the black screen and row of smilies. Worse, it persists into other pages. When I hit the back button in the browser, the previous page is still covered by all blacked out background.
This is on Android version of the most current (and last version of Firefox). Tried to update FF, and reboot, but still... Same results.
EDIT: Well, after JoJo Gibbs'd me (smacked the back of my head - for those living under a rock) and explained 2 posts below... This is now sorted for me.