icecat ublock-origin? (Re: ublock extension for ungoogled-chromium)

[Remco]

But what about icecat?  The description of the ublock-origin-chromium
states:

> uBlock Origin is a "wide spectrum blocker" for IceCat and
> ungoogled-chromium.

A ublock-origin-icecat or ublock-origin-xpi does not exist.  There's a
ublock-origin package with outputs xpi, firefox and chromium (see
gnu/packages/browser-extensions.scm) but it's not exported.  Are these
artifacts of different times or a work in progress?

Also removing ~/.mozilla/icecat (as removing ~/.config/chromium) doesn't
help to get ublock-origin-chromium to work with icecat.

R.