The challange:
You can find the password for the next level on this page, but rightclicking has been blocked!

Completing the challange:
I can still rightclick on the page, but not in the block. I am greeted with the following message when I do:

So lets not use the right click. We can open the developer console with F12 in firefox. Inside the inspector tab we can see the html code. Lets expand it all and look for the password. We can clearly see the password for natas2.