Mozilla Firefox has a similar function to PasswordSafe,
being able to store passwords in an encrypted file.
However, this is less easy to manage that with
PasswordSafe (e.g. make backups, copy between PCs etc).
I suggest an import function with which I could import
into my PasswordSafe database all the entries in my
Firefox profile's stored passwords. This would need to
have a merge function.
Also an export function allowing the bulk transfer of
passwords to configure a Firefox profile. Ideally,
this too would have a merge function; however, a
simpler implementation might limit it to generating a
new stored password file in a profile where none exists