The only problem
With using file level sync tools to try and sync passwords between multiple devices (say PC, laptop & mobile) is a) knowing which files to sync b) hope the sync tool is avail on each device c) hope you don't mind quitting your browser everytime the sync tool needs to overwrite the older file d) hope you remember to sync before changing or adding a new password on a device...
In other words it's pretty darn unworkable. But hey, where would we be without sadists?