Clearing Flash cookies using Firefox

Back in March, we shipped Firefox 4 with a feature that sends a signal to plugins like Flash and Silverlight when you clear your cookies. Adobe has announced that starting with Flash Player version 10.3, they'll be listening to the signal! This is exciting, because clearing your flash cookies is as easy as clearing regular cookies in this latest version of flash.

Here's when Firefox 4 tells Flash Player version 10.3 to delete LSOs (Flash cookies):

• When you clear all your cookies in Firefox using "clear recent history" [how-to link]
• When you choose "forget about this site" in your library (history) window [how-to link]
• When you quit Firefox, if you have Firefox configured to clear your cookies automatically upon exit [how-to link]

Chrome and Internet Explorer are also supporting this behavior, so this is fantastic news for everyone's privacy on the web!

More reading for techies:

• The relevant Firefox bug
• The NPAPI specification
• Previous story about supporting Private Browsing mode