When launched (for instance) on Webkit r34130 this Automator shell script boosts the Sunspider javascript results from:
4171.2ms +/- 0.2% to 2539.0ms +/- 0.3%, (faster than webkit itself) and
Acid3 test from:
74/100 (linktest failed) to 100/100
Gives access to the new style Web Inspector.
Stability seems unimpaired.
Use in Dock to launch iCab.