I get the following while running the test_canvas.html mochitest (on Mac) libc++abi.dylib: pure virtual method called Program received signal SIGABRT, Aborted. 0x00007fff89c67212 in __pthread_kill () (gdb) bt #0 0x00007fff89c67212 in __pthread_kill () #1 0x00007fff8bfb7af4 in pthread_kill () #2 0x00007fff8bffbdce in abort () #3 0x00007fff89554a17 in abort_message () #4 0x00007fff89552490 in __cxa_pure_virtual () #5 0x00000001029748cc in GrGLVertexBuffer::bind () at /Users/snorp/source/mozilla-central/gfx/skia/src/gpu/gl/GrGLVertexBuffer.h:45 Previous frame inner to this frame (gdb could not unwind past this frame)