I upgraded to OSX 10, Mountain Lion from OSX 8, Snow Leopard.
I had a number of URLs viewed in Firefox saved on my desktop by drop-n-drag method.
In Mountain Lion, each time I double click these saved URls I get a bouncing Finder icon and a error message from Apple's QUICK LOOK.
"You can't navigate within Quick Look. Do you want to open this item?"
The "item" is already open. It happens with every Firefox created URL, but it does not happen in Safari created URLs. Thus ... I think its a Firefox issue.
I cannot find any info in mac forums on-line.
Thanks in advance.
(Firefox makes Safari seem like it was created with no one paying attention.)