Usually the limitation is the Operating System used or the file system on the drive (USB stick!) that poses a limit.<br /> There shouldn't be problems to save large files it the file system supports the file size. If you have problems then do the usual checks for extensions or anti-virus software that may be blocking files. *http://kb.mozillazine.org/Unable_to_save_or_download_files *https://support.mozilla.org/kb/Unable+to+download+or+save+files