InTechSpot  

This toolbar displays the hosting location, country, longevity, popularity, and an abstracted risk rating for each site visited, and it is only requires FireFox 1.0 or later on all platforms.

The toolbar runs on any operating system supported by Firefox and displays the hosting location, country, longevity, popularity, and an abstracted risk rating for each site visited.
Additionally, the toolbar blocks access to phishing sites reported by other members of the Netcraft Toolbar community and validated by Netcraft, mobilizing the community into a giant neighborhood watch scheme which empowers the most alert and experienced members to protect the vulnerable against fraud and phishing attacks. Well over 7,000 phishing sites have been detected and blocked by people using the Netcraft Toolbar since the system started at the turn of the year.
It is available to download from the Toolbar website, and requires no special administrator privileges to install.
Customized versions with corporate branding and navigation are also available.

Download it