yahoo beta mail doesn't work on Firefox 5.0
when trying to acces my mail account on Yahoo, it said that the version of Firefox didn't support the latest Yahoo-mail. It said that I needed to upgrade to FF 4.1 I believe. Since you've just introduced the FF 5.0 I thought that meant downgrading! Hope you can solve this, Yahoo I also contacted but they haven't replied yet...as usual.
Thank you in advance,
happy regards, martijn hullegien
Opaite Mbohovái (2)
Try faking your user agent string to Firefox 4 using https://addons.mozilla.org/en-US/firefox/addon/user-agent-switcher/ because Yahoo didn't test mail with Firefox 5 yet - this browser is "unsupported".
My contacts will load in IE9 and they do come up when I am writing an email in Firefox 5. So I just pull up IE9 when I want to edit my contacts.