There are some links on different sites that are formed by running a Java script on different events like page loading or pressing a button. IDM Grabber can run all such Java script to retrieve such links. But in some cases when running a script, the Grabber may run unwanted commands like starting an installation of a component. Use "Process Javascript" option with caution and only if you know that the site has no malicious Java script, or if you trust the site you are downloading from.

 

Even with this option turned off, the Grabber will screen the text of Java script and retrieve most of the links except those which are derived from complex Java script expressions.