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Mozilla core have disabled "legacy" add-ons (add-ons which are not based purely on WebExtensions) in Firefox 57. Because legacy add-ons are not supported from mozilla57 any more, many interfaces have been removed from Mozilla core.
Despite the interface removals, Thunderbird 57-60 and beyond and Seamonkey will '''<u>still support</u> these as legacy add-ons <u>if</u> the appropriate modifications are done to the add-on to adapt to the changed interfaces'''.
In addition, Thunderbird will be adding WebExtension support ({{bug|1396172}}) while maintaining "legacy" add-ons and hybrid add-ons.
