The information on this page pertains to version 1.0.x of Marker. For information regarding Marker version 1.1 and newer please go here.
The last version of Marker User Script is 1.0.3. This version is needed for Mac OS 10.9 Mavericks, but aso includes all functionality needed for OS 10.8 Mountain Lion.
The previous version is 1.0.2, intended for use on OS 10.8 only.
Neither version works on OS 10.7.