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XUL is the name of Mozilla's old UI language [1]. They've been in the long process of moving UI pieces from XUL into HTML5 (such that the Browser's UI controls
by WorldMaker 5y ago
XUL is the name of Mozilla's old UI language [1]. They've been in the long process of moving UI pieces from XUL into HTML5 (such that the Browser's UI controls use the same renderer as the Browser's contents). One key piece of that was disabling the ability for extensions to use XUL a while back that caused a lot of churn in Firefox extensions.
The impression from that is that they want to entirely get rid of XUL.dll at some point in the future.
[1] https://en.wikipedia.org/wiki/XUL https://en.wikipedia.org/wiki/XUL