Disk Cache – The browser disk cache has been disabled to decrease disk size and the number of writes to the disk, possibly increasing disk life. Update Prompt – As updating the browser on a flash drive can be very slow, Firefox Portable asks you if you'd like to update rather than doing it automatically. Issues Add-ons and extensions appear to take longer to install. Constant read-writes to an external flash drive may decrease the life expectancy of the drive. Multiple profiles are not supported (a somewhat hidden feature in the official Firefox); however, PortableApps.com released Multiple Profile Support for Firefox Portable. See also Mozilla Firefox PortableApps.com Portable application creators Waterfox References External links Firefox Portable software