Yes. IE10. :sofa:
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You could try forcing a refresh on Firefox for the favicon files themselves.
Delete the favorite shortcut.
Restart Firefox
Visit both http://www.mobilediscodirectory.co.uk/favicon.ico and http://www.forum.mobilediscodirectory.co.uk/favicon.ico directly and do a CTRL-f5 on each.
Re-add the shortcut as a favorite.
I forgot to mention that this didn't work. I still have the really strange favicon on my favourites bar shortcut. Firefox shows the correct one on my tab title but not in my favourites bar.
I've decided that it's not causing any problems and I've grown kind of used to it now so I've just left it as it is!!
Thanks for the suggestion, anyway, Marc! :)
Just a quick update.
Firefox was running very erratically with regular crashes and "not responding" messages so I did a refresh of the software (via Help> Troubleshooting, etc) and when I restarted it the original MDD favicon is back!! Hurray!! :)