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by majewsky 2544 days ago
If I understand [1] correctly, the XUL code that those old addons use as an interface into the browser is nearly gone. And that's the entire point of deprecating the old addons: to be able to refactor Firefox internals away from XUL towards pure HTML/CSS/JS-based UI.

[1] https://bgrins.github.io/xbl-analysis/graph/