Google released two new extensions for Firefox few hours ago. They are called Blogger Web Comments (BETA) and Google Safe Browsing (BETA). They are currently available at Google Labs.

Blogger Web Comments for Firefox is an extension that makes it easy to see what bloggers are saying about a page you’re viewing in Firefox and even make your own blog post about it, all without leaving the page you’re on.

Google Safe Browsing is an extension to Firefox that alerts you if a web page that you visit appears to be asking for your personal or financial information under false pretences. This type of attack, known as phishing or spoofing, is becoming more sophisticated, widespread and dangerous. That’s why it’s important to browse safely with Google Safe Browsing. By combining advanced algorithms with reports about misleading pages from a number of sources, Safe Browsing is often able to automatically warn you when you encounter a page that’s trying to trick you into disclosing personal information.
UPDATE
I just learned that these are US-only extensions for now… and if you’re outside US you won’t be able to install this.
There’s a work around to install this extension though.
(Courtesy of Digital Inspiration, labnol.blogspot.com)
1. Download google-safebrowsing.xpi and google-webcomments.xpi in IE or Opera, choose Save.
2. Start Firefox and drag the google-safebrowsing.xpi and google-webcomment.xpi onto the Firefox interface.
3. Restart Firefox.
Links:
Google Labs
For US visitors:
Install Google Web Comments
Install Google Safe Browising