https://downloads.yahoo.com/
Yahoo browser extensions - news, sports and finance
Customize your browser with Yahoo Firefox, Edge and Chrome extensions. Get the latest news and information you love on every new browser tab you open.
yahoo browsernews sportsextensionsfinance
https://simonwillison.net/2006/Sep/29/yahoo/
Yahoo! Browser-Based Authentication
This is a Really Big Deal. Yahoo! has over 200 million /active/ user accounts.
yahoo browserbasedauthentication