Images no longer appearing properly on firefox

You can see for your self at http://www.aaquacks.com
If you view on firefox, the "Who's Online" block in the footer, doesn't load or show all the little bulb icons.
On Explorer, they appear fine.
I thought it was only an issue with me, but some of my other members confirmed the same thing with them.
I believe it started after the last Firefox update.
Is this something that needs fixing with Integramod?
Or any ideas what to do?
Currently the coding I am using is <img></img>
On other thing to test would be rewriting it all in bbcode, but wanted an opinion before I make that drastic step.
If you view on firefox, the "Who's Online" block in the footer, doesn't load or show all the little bulb icons.
On Explorer, they appear fine.
I thought it was only an issue with me, but some of my other members confirmed the same thing with them.
I believe it started after the last Firefox update.
Is this something that needs fixing with Integramod?
Or any ideas what to do?
Currently the coding I am using is <img></img>
On other thing to test would be rewriting it all in bbcode, but wanted an opinion before I make that drastic step.