We explained Flash Cookies in detail back in 2007 when a larger group of Internet users became aware of them. More than two years have passed since then with Flash cookies still playing a major role on many popular web services and for many advertising agencies.

Here are four options to deal with Flash cookies:

Option 1: Adobe Flash Player Settings

Probably the best option to deal with Flash cookies is to open the Adobe Flash Player settings. Users can look at the stored Flash cookies, delete some or all and change several options that change or even block Flash cookies on the user system.

Option 2: The manual way

Flash Cookies are stored on the local computer system. Their location varies depending on the operating system. Flash cookies are stored as *.sol files in the operating system. Here are the locations they can usually be found in:

• Windows: LSO files are stored typically with a “.SOL” extension, within each user’s Application Data directory, under Macromedia\Flash Player\#SharedObjects.
• Mac OS X: For Web sites, ~/Library/Preferences/Macromedia/Flash Player. For AIR Applications, ~/Library/Preferences/[package name (ID) of your app].
• GNU-Linux: ~/.macromedia, ~/.macromedia/Flash_Player/#SharedObjects, ~/.adobe

The process of deleting those flash cookies could be automated with the right software program, e.g. CCleaner for Windows.

Option 3: Firefox add-on Better Privacy

The Firefox add-on Better Privacy can delete Flash cookies regularly to get rid of them automatically with options to whitelist some Flash cookies that are needed, e.g. for storing high scores on your favorite gaming website or playback settings on Youtube.

Option 4: Flash Cookie Cleaner (Windows software)

Flash Cookie Cleaner is a software program for the Windows operating system. The portable software program can be used to delete all stored Flash cookies of the logged in user. It is available at the developer’s website.

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.