Comment 13 for bug 562423

There are many web pages that will do it for you.

Here is the first google hit: http://www.motobit.com/util/base64-decoder-encoder.asp

NOTE: You will be sending your password in clear text to the web page provider that will convert it to BASE64 for you. They won't necessarily know it's your password or anything, but I just wanted to warn that you are giving it to someone.