I have written an article about Flash Cookies last year and it turned out that several users did not know they existed and were grateful that they were now able to take care of them. Flash Cookies are not stored in the usual location where the other cookies are stored but in %APPDATA%\Macromedia\Flash Player on a computer running Microsoft Windows, ~/.macromedia in Linux and ~/Library/Preferences/Macromedia/Flash Player in Mac OS X.
Users can delete the cookies in that directory regularly or on a website. There is no direct way in Firefox to delete those cookies. That is, until now. The Firefox extension Better Privacy is a cookie manager for LSO Flash Objects and DOM Storage Objects. Flash Cookies (Local Shared Objects) are placed on the computer by a Flash application like the Youtube Video Player.
These cookies can be set to never expire which is obviously an excellent opportunity to track and analyze users. Another difference between flash and normal cookies is the size limitation. Normal cookies cannot exceed 4KB while Flash Cookies have a default size of 100 Kilobyte but the range is between 0 and Unlimited Kilobytes!
Better Privacy deletes Flash Cookies and DOM Storage cookies by deleting them on every startup. This setting can be changed to prevent the deletion of flash cookies that are needed. Several browser games make use of Flash cookies to save the progress of the player. The alternative option is to delete them manually in the options that are provided by the add-on.
When you run the add-on after installation, by selecting Firefox > Add-ons > Better Privacy > Options, you are presented with a list of cookies currently saved to your system. Here you can remove one, multiple or all Flash cookies right away from the system so that they can't be used anymore by the applications that set them on it. Note that Flash cookies sometimes are used for things such as game saves and that clearing the cookies will remove those saves from the computer, so be careful before you delete them.
You can add cookies to a protected lists so that they are not deleted automatically. The options provide you with preferences to delete Flash cookies on start or exist of the browser, or by timer instead.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.