Yahoo offers a web browser toolbar which includes apps for leading sites like Facebook, Yahoo! Mail, Weather and News. Yahoo Toolbar also known as Y! Toolbar is available for Internet Explorer, Firefox and Google Chrome web browsers.
Yahoo Toolbar is one of the most popular and widely installed web browser add-on/extension. Many popular softwares like Java Update and thousands of free
Source: Yahoo Toolbar Vulnerability Triggers Non-Exploitable XSS Payload on All Websites
