RE: woox's config
Before installing or using any software, it's always recommended to read up a little about what they offer and their service practises.
LastPass' Privacy Statement:
https://lastpass.com/aboutus_privacy.php
Remember you can set-up 2-factor authentication in the LastPass settings.
I've been using ZenMate for about 6 weeks, and I haven't had any issues.
I think both services are Safe to use, both offer different services. LastPass will handle your sensitive data with encryption, whereas ZenMate hides your online presence, by masking your real IP with another one, or a different geo-location.