%APPDATA%\Macromedia\Flash Player\#SharedObjects\

Flash LSO's are not stored in Firefox profile folders at all, they are stored in a separate folder under your Windows user profile managed by Flash. A shortcut to the folder that you can open from the Start menu Search box or the address bar of Windows Explorer is: %APPDATA%\Macromedia\Flash Player\#SharedObjects\ Here you typically find a folder for each site that has stored data. It should match the list that you can view on this page: http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html (Note: Macromedia was the original developer of Flash before being acquired by Adobe.) Anyway, the bottom line is that the same Flash LSOs are visible in every Firefox profile of the same Windows user.