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I tried testing it out on a ThinkPad T61 to see how well it works with an older embedded GPU (Intel 965 Express), but I can't enable it (on Windows 10) because

I tried testing it out on a ThinkPad T61 to see how well it works with an older embedded GPU (Intel 965 Express), but I can't enable it (on Windows 10) because D3D11 compositing is disabled, it says D3D11_COMPOSITING: Blocklisted; failure code BLOCKLIST_ So does that mean that it is known not to work with that GPU? Can you override the blocklist to see what happens? Edit: It also says: > Direct2D: Blocked for your graphics driver version mismatch between registry and DLL. and > CP+[GFX1-]: Mismatched driver versions between the registry 8.15.10.2697 and DLL(s) 8.14.10.2697, reported. Indeed that is correct, the driver is marked as version 8.15.10.2697 but the fileversion of the dlls are 8.14.10.2697, this seems to be intentional by Microsoft or Intel, note that the build numbers are still the same. Firefox is quite naive if it thinks it can just try to match those.

MrRadar 9y ago
Take it from a Thinkpad X60 owner, the Intel GPUs from that era are absolute trash. They don't support OpenGL 3.0 on any platform (in fact, they didn't gain 3.0+ support until Sandy Bridge in 2011(!)) so don't expect any of this recent GPU-centric work (which seems to be targeting OpenGL 3.0+) to work on these GPUs. It would probably work just fine on the contemporary Radeon and GeForce cards since they support OpenGL 3.3.