The newest version of Firefox intends to have a Google spying mechanism built into the browser.
Anti-phishing capability, which Mozilla has branded "Safe Browsing," is one of the marquee features in Firefox 2.0 and one of the reasons a third alpha is necessary. Now baked into Firefox 2.0 alpha 3, Google Safe Browsing is triple-licensed under the Mozilla Public License (MPL) 1.1, the GPL 2.0 (define) and the LGLP (define).
Safe Browsing inspects a visited site against a regularly updated list of known phishing sites. The list of phishing sites may be downloaded automatically within the browser or can optionally be checked against Google's online list of known miscreants.
A while ago I noticed the new IE beta labeled one of my sites as a risky potential phishing site (although it had nothing but a general search box on it). Does Google consider you a miscreant? What happens if they do? Imagine if these companies ever compete in your market and accidentally destroy your brand. How much can we trust the new gatekeepers?