If, like me now, are using Firefox for Android with user scripts and if, like me (because of COLLECTION HIGHLIGHTER), this feature is vital:
Quickly go to Google Play Store to DEACTIVATE FIREFOX AUTO-UPDATE! as version 68.11.0 is the last version that can install Violentmonkey or any other user script extension/add-on, at the moment.
Extension/add-on list for Firefox for Android version 79 does not include Violentmonkey, Greasemonkey, Tampermonkey nor Stylus.