Flash cookies are a new way for storing a lot more information about you than with normal cookies. Normal HTTP cookies can’t save more than 4 Kilobyte of data while Flash cookies can save up to 100 Kilobyte and they are not shown in the list of cookies that you can see in your web browser.
I was searching for a way to check Flash cookies on my computer but could not find it. After reading some information on the Adobe Flash Player website I was able to realize that the only possibility to check them was to open a page on the Adobe site which would show them.
Settings Manager can be accessed from the Adobe website but is running locally on your computer. The Website Storage Settings display all Flash cookies that are currently saved on your computer.
For disable Flash Cookies, go into Global Storage Settings and disable the option “Allow third-party Flash content to store data on your computer”.