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They are just mirroring Firefox's (and thus Gecko's) own deprecation of XUL in favour of (X)HTML. Firefox's top level windows are now (X)HTML with XUL elements
by KwanEsq 6y ago
They are just mirroring Firefox's (and thus Gecko's) own deprecation of XUL in favour of (X)HTML. Firefox's top level windows are now (X)HTML with XUL elements, and XUL specific elements and code paths are gradually being replaced with standard HTML elements or custom elements.