how to open facebook account without passwords?

[Mmhan]

[shaEina]

You can't. Unless it's already logged in.

[Umar Shareef]

If you are talking about your account :
Log in. Check the option that says "Keep me logged in". Never log out.

If you are talking about others' account :
That's not possible.

[Gurutech]

It is only do when your account is already logged in.

[Veer]

It is Simply Not Possible, Even if your Account is already logged in and you are opening the browser again after some time. It can take you straight to your Facebook Page, in this scenario also it used your cached Password to Log you in.

Without Password you Can't Login.

[C J]

You can't.You need a password.

[Wills]

password is a must for login security purpose.

or you just repeat the same word "password" on the password text-box... and wait for upcoming hackers, intruders and unauthorized access to use your facebook profile, pictures, friends and etc.