Yahoo! and at&t mail say your browser is blocking Flash
Update: Yahoo is rolling out a fix for this issue. Try shift-reloading the page (hold Shift and click the Reload button) to fix it.
Some Firefox users of Yahoo! and at&t email may see a message when they log in that says, "Your browser is blocking Flash." It appears that the website can't detect the latest version of the Flash plugin and therefore claims it's been blocked. You should be able to click OK and continue using the site normally.
If you find that you have problems with the site or if dismissing this message becomes troublesome, you can switch to the "Classic" view until the problem is corrected.
Click on Options in the upper right corner of the email site.
Select Mail Classic... from the menu.
Confirm your choice by clicking Switch to Mail Classic.