I have FF 1.0 Here's how it works here:
With FF running, find and click on 'Tools' on the top left toolbar,
it should be to the right of File, Edit, View, Go ..
A dropdown box appears under Tools.
Fifth item down (or so) should be Adblock if you have that, just under Downloads.
Click on Adblock. A smaller popup appears to the right.
You want the bottom option 'Preferences'.
Click on that and a new small window should list all adblocked URLs.
You will have to search manually, no search function found here.
Find the junk you want to restore. Left-click once to highlight the item.
RIGHT-click gives you the option to Edit the filter (change the wildcard say,,)
or to DELETE it.
To Restore the image or whatever, you DELETE it from the Adblock list.