This bug was filed from the Socorro interface and is report bp-f0930677-2178-4967-9e28-6889e0171203. ============================================================= Seen while looking at crash stats: http://bit.ly/2AJOx1T. Comment says "I tried to enable webrender in firefox nightly and now I can't really open it anymore" Top 10 frames of crashing thread: 0 firefox mozalloc_abort memory/mozalloc/mozalloc_abort.cpp:33 1 firefox abort memory/mozalloc/mozalloc_abort.cpp:80 2 libxul.so std::panicking::rust_panic src/libpanic_abort/lib.rs:59 3 libxul.so std::panicking::rust_panic_with_hook src/libstd/panicking.rs:593 4 libxul.so std::panicking::begin_panic<&str> src/libstd/panicking.rs:538 5 libxul.so gleam::ffi_gl::missing_fn_panic toolkit/library/x86_64-unknown-linux-gnu/release/build/gleam-3f78fb01dd699e52/out/gl_bindings.rs:993 6 libxul.so webrender::device::Device::begin_frame gfx/webrender/src/device.rs:722 7 libxul.so webrender::renderer::Renderer::new gfx/webrender/src/renderer.rs:1514 8 libxul.so webrender_bindings::bindings::wr_window_new gfx/webrender_bindings/src/bindings.rs:747 9 libxul.so mozilla::wr::NewRenderer::Run gfx/webrender_bindings/WebRenderAPI.cpp:74 =============================================================

It seems like a dup of Bug 1421549. It was merged to m-c today.