Yes, same here. As well as: https://trisquel.info/en/forum/icecat-abouthome-1
Firefox is dropping support for all XUL based addons. That affects a lot more in the repos than just the icecathome and torproxy addons.
https://wiki.mozilla.org/WebExtensions/FAQ#Which_add-ons_will_stop_working_when_XUL.2FXPCOM_is_deprecated.3F
