It's really nice to see these sorts of things appearing for Firefox. Yahoo has released a beta of it's new toolbar for the popular Firefox Web browser. There is only a Windows version as of yet, but one can only assume that a Linux version could be on the cards. There are some nice features, such as Search This Site" option and "Translate This Page", and the software will allow you to easily discover and add RSS feeds to My Yahoo!
Download from here.
"The Yahoo Toolbar provides Internet users with a faster, safer and personalized Web experience. Yahoo is now making this functionality available to Firefox users, enabling them to improve their Internet browsing experience using Yahoo's industry-leading toolbar." - Eckart Walther, director of product development at Yahoo! Search.