How do you view prefs for web-extensions add-ons

Eric Bixby ebixby at
Thu Sep 28 21:15:50 UTC 2017

I'm trying to debug an add-on using localStorage to save prefs.  The old
way is to type "about:config" in the address-bar and then filter by the
add-on's id.  I tried using Mozilla Dev Tools, but I don't see anything
under local storage.

What's the new way to inspect/view add-on prefs?
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