How to Extract 3D models from WebGL? help please?

[FAPsenpai911]

Hello there i am new here....joined the forum for this particular Post only!

Ok So my Objective is no intention of stealing models or making money, i collect models for me and friends to do fanarts in deviantart or 4Chan!

SO here it is I know there are experts here in this website and solely i will ask one question and please write the answer in steps, so that who comes here could be helped too!

Question: How can one person like me Download a Webgl(Displayed 3D model on Browser) Download the model? And how can one convert from that format to a more supportive format?
I am using Latest Firefox Beta version and installed Greasemonkey so if you may please help me with the next steps.....

I know some posts are there about it but i seen that they haven't wrote it with much of a detail....

So if you will anyone can answer the Tutorial i want? it will help a lot of person here.