User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.3a) Gecko/20021212 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.3a) Gecko/20021212 The browser refreshes in an infinite loop. From viewing the mail under Mozilla 1.0.1 and 1.1, or Internet Explorer, the browser refreshes the page once. However, under Mozilla 1.2.1 and 1.3 it becomes impossible to read mail simply because the browser reloads the mail page before you can read the mail. Reproducible: Always Steps to Reproduce: 1. Log into a yahoo mail account. 2. Click on the Inbox to view new messages. 3. Click on the link to view a specific message Actual Results: Browser beging infinite refresh loop. Expected Results: Display the page and stop.
The page's JS is designed to go into such a loop if it can't set the cookie (it sets the cookie, then tries to read it, and reloads if the cookie is not present). So on this site, your options are to turn off that option or get the site to fix their code.