Firefox/XUL and XBL Replacement

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Summary

Originally, XUL filled feature gaps in the Web platform needed to build the Firefox UI. Now, the web has evolved enough that these gaps are largely closed. By more closely aligning the Firefox UI with web standard technologies, we expect to be able to move faster and better focus on performance and tooling for the web.

The work is being done in a number of separate projects. See the XUL/XBL Replacement Roadmap document for more details.

Tracking Dashboard

The XBL Replacement project has a website, including a set of graphs tracking progress, and a binding tree showing inheritance and features used for each binding.

CSS flexbox emulation is running in a couple of talos tests - tart and ts_paint.

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