You have no extensions, or you have no extensions that appear suspicious? Don't trust the names; if in doubt, disable, or try testing in Firefox's Safe Mode. That's a standard diagnostic tool to bypass interference by extensions (and some custom settings). More info: Diagnose Firefox issues using Troubleshoot Mode.

You can restart Firefox in Safe Mode using

Help > Restart with Add-ons Disabled

In the dialog, click "Start in Safe Mode" (not Reset)

Any difference?

Could you also check your connection setting to see whether it has an unexpected routing.

orange Firefox button (or Tools menu) > Options > Advanced > Network mini-tab > "Settings" button

The default is "Use system proxy settings" and you also could try "No proxy"

Some "redirect viruses" are deeply embedded and require a rootkit remover to uncover. This article has a link to TDSSKiller, which is useful in such cases: Troubleshoot Firefox issues caused by malware.

Now that is interesting--I tried your first solution (restarting Firefox in safe mode). This worked; no more redirecting when I click on a search link.

The odd thing is, I only have three extensions listed, and all three previously were and still are disabled. I don't have the option to delete them (the only clickable thing is "enable"). I have tried a few searches in safe mode, and then after restarting Firefox, and the solution is holding thus far. Thank you! I hope it continues to work...

To handle such tricky redirect virus. you can remove it manually. see the guide on this page

Advertisment removed by moderator This link is for paid chat support and is not proven to help. Also the quality of the help guide is bad. Much of the information is made up.