(static) fmtCmd :function
(static) LOG :Logger
(static) unwrapObject :function
Starting with FF4 lots of objects are in an XPCNativeWrapper, and we need the underlying object for == and for..in operations.
This function replaces native Selenium command-handling for the exitScript command. (See TestLoop.prototype.resume() in chrome/content/selenium-core/scripts/selenium-executionloop.js.) This causes the script to simply halt rather continuing on to the next command.