Foxmarks: Help: Sync Profiles and Password Sync

From Foxmarks Wiki

Why do I need to enter a PIN to setup Sync Profiles for my passwords? How is this secure?

To show you the websites for which you have saved passwords, we first need to decrypt your passwords using the same PIN that we used to encrypt them. This PIN will not be saved on disk or in memory and it will not be sent over the network. Decryption will be performed locally on this computer and will not be cached.

Additionally, only information about the website (domain and realm) and username will be presented here. Your actual passwords will not be made available for viewing, and they will not be stored on disk or in memory. All encrypted information relating to passwords will be flushed from memory when the Sync Profiles dialog window is closed.