ESR115: figure out extension pinning / unified Extensions
IIUIC we don't ship with NoScript on the toolbar (and in the past we also removed HTTPS-Everywhere?) - not sure of the full reasons, but width is at a premium and I believe the idea was to get users to use the slider, not NS itself. Correct me if I'm wrong ```js user_pref("extensions.unifiedExtensions.enabled", false); ``` Note: there's [1808459](https://bugzilla.mozilla.org/show_bug.cgi?id=1808459) Unified Extensions when empty ignores `extensions.getAddons.showPane` - but hopefully that will be fixed come ESR115
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