Not anymore: as I posted last night[1], Mozilla could choose to give themselves access to your password, when you create your account or when you change its password. Anyone who is able to successfully MITM you & Mozilla (say, someone with a Komodia cert if you're infested with Superfish, or any of the CAs in the world, or anyone who can compel them to certify a MITM cert) can do the same.
Google do allow you to use your own passphrase, so conceivably at this point Chrome is at least somewhat more secure than Mozilla.
