With the release of iMacros for Firefox 10.0, some features are only available with a Personal Edition (or higher) license. Please use the scripting interface available with the Enterprise Edition instead, which allows you to control Firefox as well as other supported browsers from external scripts and programs (Javascript, Python, Perl, C++, C#, etc)
The following commands and variables are newly supported in iMacros 10:
IMacros for Firefox 10 is a complete rewrite of the add-on for Firefox Quantum (v56 and later) with an updated, cleaner user interface.