Crash report: https://crash-stats.mozilla.org/report/index/3126417d-e200-4478-a774-76dee0210422

MOZ_CRASH Reason: MOZ_CRASH()

Top 10 frames of crashing thread:

0 mozglue.dll mozalloc_abort memory/mozalloc/mozalloc_abort.cpp:33
1 mozglue.dll mozalloc_handle_oom memory/mozalloc/mozalloc_oom.cpp:51
2 xul.dll gkrust_shared::oom_hook::hook toolkit/library/rust/shared/lib.rs:133
3 xul.dll std::alloc::rust_oom ../2fd73fabe469357a12c2c974c140f67e7cdd76d0//library/std/src/alloc.rs:331
4 xul.dll alloc::alloc::__alloc_error_handler::__rg_oom ../2fd73fabe469357a12c2c974c140f67e7cdd76d0//library/alloc/src/alloc.rs:397
5 xul.dll _rust_alloc_error_handler 
6 xul.dll alloc::alloc::handle_alloc_error ../2fd73fabe469357a12c2c974c140f67e7cdd76d0//library/alloc/src/alloc.rs:366
7 xul.dll webrender::hit_test::HitTestingScene::new gfx/wr/webrender/src/hit_test.rs:190
8 xul.dll webrender::scene_builder_thread::SceneBuilderThread::process_transaction gfx/wr/webrender/src/scene_builder_thread.rs:664
9 xul.dll webrender::scene_builder_thread::SceneBuilderThread::run gfx/wr/webrender/src/scene_builder_thread.rs:317

The allocations here are a few hundred kb, so they aren't super large. My guess this is a symptom of the GPU process using a lot of memory or something.

Closing because no crashes reported for 12 weeks.