Well, when I first installed the EMatrix package, no hosts files were being listed in EMatrix's configuration interface (chrome://ematrix/content/dashboard.html#hosts-files), but then at one point 4 hosts files decided to pop up for whatever reason and they enabled themselves automatically. I was able to disable them, but when I reset my Iceweasel-UXP to factory defaults they were automatically reenabled again and they updated themselves. The hosts files are the following:
*URLhaus blocklist (the only libre one, under public domain). Stored locally in chrome://ematrix/content/asset-viewer.html?url=urlhaus
*Peter Lowes Ad and tracking server list (under custom non-free license that forbids ALL commercial use (see https://pgl.yoyo.org/license/)). Stored locally in chrome://ematrix/content/asset-viewer.html?url=plowe-0
*Dan Pollocks hosts file (non-free, probihits commercial use). Stored locally in chrome://ematrix/content/asset-viewer.html?url=dpollock-0
*MVPS HOSTS (under proprietary "Creative Commons" NC license); chrome://ematrix/content/asset-viewer.html?url=mvps-0
This problem is not exclusive to EMatrix, I am aware that UMatrix also fetches (or used to fetch) non-free hosts files. If you want to test this, try to temporarily delete your ~/.hyperbola/iceweasel-uxp in order to reset EMatrix to its default state, and then check chrome://ematrix/content/dashboard.html to see if EMatrix is trying to fetch non-free files in your setup too
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