[yefragetuwrabrumuy]

Next they should look at blocking Flash cookies.

To explain, there is a feature in Adobe Flash that is like a “cookie backup”, so if you delete the cookie in your browser, all the data is maintained in the invisible Flash cookie, and as soon as your browser cookie is remade, it is loaded with all the old data, with you none the wiser.

http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html

Fortunately, at this website, Adobe provides a Flash cookie manager. While this looks like a picture, it is actually a dynamic control panel, called “Website Storage Settings panel.”

It displays what Flash cookies are on your system, and allows you to manipulate them in several ways, including deleting them. Since they are the backup, it is probably best to delete them before you delete your browser cookies in the ordinary way.

[brityank]

Next they should look at blocking Flash cookies.

Go get Better Privacy ^ for clearing out those cookies.

Better Privacy serves to protect against special longterm cookies, a new generation of 'Super-Cookie', which silently conquered the Internet. This new cookie generation offers unlimited user tracking to industry and market research. Concerning privacy Flash-cookies are most critical.
This add-on was made to make users aware of those hidden, never expiring objects and to offer an easier way to view and to manage them - since browsers are unable to do that for you.

Flash-cookies (Local Shared Objects, LSO) are pieces of information placed on your computer by a Flash plug-in. Those Super-Cookies are placed in central system folders. They are frequently used like standard browser cookies. Although their thread potential is much higher as of conventional cookies, only few users began to take notice of them.

I have it set to clear all when I close FF. No problems with any flash or youtube-type vids. Great add-on!

[daniel1212]

If Adobe could deal with the high cpu load it places on some PCs some would appreciate it:. http://forums.adobe.com/thread/1043779?start=160&tstart=0