The fix doesn't seem to work if you've been using Firefox Beta (67.0b16), or if you then install Stable (66.0.4) and sign in to sync - all addons are still marked as "legacy" and not enabled.
However, if you find each one in the store and (re-)install them - they work again and their data is back intact as expected.
However, if you find each one in the store and (re-)install them - they work again and their data is back intact as expected.