Yahoo Toolbar for Firefox - integrated search, access to email and chat
Conclusion: I don't think the toolbar is ready for us yet. My wife had way too many problems getting this to work. Maybe we'll try again after it's gotten some of the bugs worked out. Many of the more dedicated Firefox users may not have any problems. If you try it out, let me know what happened.
Website - Freeware or Ad supported (most of Yahoo's services are ad supported and Yahoo can collect information it gets from your use of it's services)
Quote from the website -
Search from anywhere on the Web
Instantly save and "re-find" pages with My Web.
Discover and add fresh content to My Yahoo!
Customize and access your Toolbar from any PC
Protect yourself from spyware with Anti-Spy for Windows