[slynux]

This bookmarklet is a type of phishing. Phishing and social engineering has been there all the time. You cannot prevent all that from a service provider point. Mega is a secure platform that operates on basis of user side encryption. The mega.co.nz javascript ui just provides a reference implementation. Browsers can be used easily to compromise user data once physical access is obtained.

If you look at Mega API and SDK, design wise it is very clean. You can build your own custom application by importing those libraries which are not prone to this kind of attacks.