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If you remove FireFox cookies after Surfing Internet
Some Flash cookies are not permanently remove by that Command
So... this is the best solution for solve that problem
Better Privacy add-on permanently and automatically remove everythig
Open FireFox
Type "addons.mozilla.org"
Type "Better Privacy" and click arrow
Click on "Add to FireFox" button
Click on "Install Now" button
Click on "Restart Now" button
Automatically the add-on displays a little confirmation pop-up whenever you close the browser before it removes anything