When I try to do a Google search in Firefox, I can't click on any of the links. They're just regular black text, not hyperlinks. I even tried safe mode and disabling all the plugins. I was running Firefox 12. I installed the current version over it and it's the same thing. Other browsers have not been affected.
This is what it looks like:
My firewall was turned off, and I had several things running which are potential security holes. I turned on my firewall and closed all unnecessary ports. I also turned off Home Sharing. Then I restarted my computer. After that, Firefox works normally again.
What do you think happened?