Google error: sending automated requests

We're sorry... ... but it appears your computer is sending automated requests.​

I've been getting this error page on Google for the past 3-4 weeks or so, in response to manually typed queries done both on the Google website directly or else from typing in the toolbar search box in the Firefox window.

Using FF 3.6.10; all plugins are current, no new addons installed recently. I know there aren't any queries being sent by other systems on our network.

I'll do the various AV scans again, but I'm pretty certain the system is ok. Anybody else having this issue, or have recently solved it?

 

ooops, it was a recent plugin. Found the culprit, it was a Firefox add-on "Google Enhancer".

https://addons.mozilla.org/en-US/firefox/addon/6435/

 

Good to see you took the initiative - http://support.mozilla.com/en-US/kb/troubleshooting plugins

 

Thx, GF, I'm relieved that it wasn't something more insidious. I'll do a bug report on the plugin's page, too.