Manage your online identities and credentials with Buttercup: An open-source, free and secure credentials manager. Buttercup uses the strongest industry techniques to encrypt and store your details in a variety of locations of your choosing. Use Google Drive, Dropbox or WebDAV  to remotely access your vault, or use a local file on your computer. Save new logins to your secure archives.

This extension requires the Buttercup desktop application to work. Your vaults are conveniently already unlocked when they're open in the desktop application, so no need to unlock them twice.