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Firefox 115 can silently remotely disable my extension on any site
(lapcatsoftware.com)
This is a most excellent place for technology news and articles.
The intent behind the feature is obviously to keep a list of known-bad domains there, to disable extensions Mozilla hasn't vetted as safe on said malicious domains.
If I had to guess, I'd say it'll be set to
""
by default, unless you crank up some security setting to extra-paranoid, or, obviously, set it yourself.