Download Imacros 

Imacros for Firefox : (recommended)
https://addons.mozilla.org/en-US/firefox/addon/imacros-for-firefox/

For Chrome
https://chrome.google.com/webstore/detail/imacros-for-chrome/cplklnmnlbnpmjogncfgfijoopmnlemp?hl=en

First Go to
C:\Users\User\Documents\iMacros\Macros\Demo-Firefox  

Then delete all the content and extract my scripts in to that folder


How to use : 
Open up firefox
Open imacros (click small icon on the upper right corner )
Log in to your addmefast account and other accounts such as Facebook, Youtube, Twitter etc.

Click Demo-firefox
Select a script

Add a loop from down and click paly loop.

For .js scripts just click play and then add a loop in javascript application.

Thanks.