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<big>'''Add-ons Guide for Thunderbird 62 63 and beyond'''</big>
(First Draft)
The picture beyond Thunderbird version 60 is rather uncertain, given the continued high rate of change in Firefox platform code. We will work with add-on authors in the coming months to determine a viable post-60 add-on strategy. Here are some general thoughts.
Work has been undertaken to keep supporting legacy add-ons "somewhat" in Thunderbird 62 63 and beyond. We implemented an overlay loader that will load XUL overlays for add-ons but may cause graphical glitches or malfunctions. We're tracking this in {{bug|1476259}}.
For legacy add-ons to work, they need to replace install.rdf file with a WebExtensions style manifest.json file, which includes the key "legacy" set to true. See Lightning as an example here:<br />
