Direct3D app screws up XULRunner

I have an app using a render engine which can switch between D3D and OpenGL (on Windows at least!) We also use XULRunner for embedded web-browser functionality. XULRunner also appears to use D3D and when our engine is in D3D mode, XUL stops working - it just renders black the whole time.

"Use OpenGL" isn't the answer I'm looking for, so what can I do? We are using D3D9.

开发者_运维技巧edit: Apparently GL support is immature, on non-Windows platforms no hardware acceleration is used by default. We've tried to disable it but either there is another bug, or we're not using the right flags. I can't find a good reference for them.

edit: Current release versions of XULRunner as used in FF 3.x don't support hardware acceleration. And yet still, the moment a D3D9 device is created, the Gecko render engine starts painting solid black.

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An old question, but both these threads have answers:

• DirectX Firefox Plugin rendering artifacts
• Writing a plugin using NPAPI + D3D. It works on Firefox, but the browser blacks out. Why?