Not much of a question, but an answer to others' archived questions. Many are concerned that Google Safe Browsing Cache violates their privacy and releases the public's web activities to one of Google's data-centers. The easiest way to disable this feature (can't be done through the Firefox web browser), is to block these URL domains on your main network router (given that you have a newer, more feature-rich router such as the latest D-link product line):
I think there are some misconceptions about this feature.
Firefox doesn't send every web request to Google, but instead consults a database of bad sites that you download from Google at regular intervals. You would only send a request to Google if you request a page on a bad site.
Google's agreement with Mozilla is that this data isn't supposed to be correlated with your other Google activity.