Problem With Pentadactyl

With both ColorfulTabs and Pentadactyl enabled, I get an error (via Pentadactyl) when clicking UI elements (e.g. the browsers back button or when interacting with the NoScript menu - using the mouse).

pentadactyl: TypeError: value is not a non-null object
pentadactyl: TypeError: value is not a non-null object::
pentadactyl: stack: 	getData@resource://dactyl/overlay.jsm:159
pentadactyl: 	setData@resource://dactyl/overlay.jsm:188
pentadactyl: 	onMouseDown@resource://dactyl-content/events.js:845
pentadactyl: 	wrappedListener@resource://dactyl-content/events.js:225
pentadactyl: toString: function () /* use strict */ String(error)

ColorfulTabs appears to change something, which Pentadactyl does not expect.

This worked previously, but started to happen with Firefox 29 (if I remember correctly).

Reported for Pentadactyl at: https://code.google.com/p/dactyl/issues/detail?id=1163