9.336 WGPU Error: Not enough memory left.

This is on a 4GB 1650 Super, latest Firefox, Win10. It's an old card, sure, but it can still play most commercial games; I'm not sure why this thing is so hungry. Lots of big volumetric textures, maybe?

I also get an error:

    Requested allocation size (41967616) is smaller than the image requires (42778624).
    at ImportMemory (../../third_party/dawn/src/dawn/native/vulkan/external_memory/MemoryServiceImplementationOpaqueFD.cpp:132)