Thunderbird addon preferences

I found in https://wiki.mozilla.org/Thunderbird/Add-ons_Guide_57 that as of 22 Dec 17 it was possible to test the new preference scheme for Thunderbird addons. However I have TB58.0b3 and the menu shown in the above webpage isn’t there. Does this mean that even though it says the new embedded webExtensions should work, they won’t until the menu item appears?
As my addons preferences seem to still work fine, does that mean that they will continue to work with TB59?
Blessings

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