In doing lying cable tricep extensions on the low pulley, when you start to use fairly heavy weight, your body may have a tendency to slide towards the weight stack as the weight is pulling your body strongly backwards.
To use more weight without sliding (this technique is best done on a cable crossover machine), hook a hip belt or straight bar to the other low pulley and set the maximum weight on the pulley.
Hook your heels inside the belt or over the bar and contract the hamstrings to act as an anchor.
With your body anchored like this, you will be able to use MUCH more weight without sliding. You can also use a straight bar attachment instead of a hip belt, if you don't have access to one.
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