Just a note for anyone landing here: link.relList.supports("manifest") will only return `true` on a product by product basis (conditional on the product actually doing something useful with web manifest)... so initially, only Firefox Preview will return "true" (bug 1603673) - but all other Firefoxes will return `false`.
Bug 1596040 Comment 9 Edit History
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Just a note for anyone landing here: `link.relList.supports("manifest")` will only return `true` on a product by product basis (conditional on the product actually doing something useful with web manifest)... so initially, only Firefox Preview will return "true" (bug 1603673) - but all other Firefoxes will return `false`.
Just a note for anyone landing here: `link.relList.supports("manifest")` will only return `true` on a product-by-product basis (conditional on the product actually doing something useful with web manifest)... so initially, only Firefox Preview will return "true" (bug 1603673) - but all other Firefoxes will return `false`.