[NickHaflinger]

'Tracks your most used directories, based on 'frecency'.'

Shouldn't that be frequency ..

https://github.com/rupa/z/blob/master/README

[therealunreal]

"Frecency is any heuristic that combines the frequency and recency into a single measure." (from Wikipedia)

I first heard it used to describe Firefox's location bar (Awesomebar).