Here are a list of crashes from this run: https://treeherder.mozilla.org/#/jobs?repo=try&revision=178ed572dcc78b5ec8123e26aca1f5c7b5115e5a&selectedJob=32653147 "file:///home/worker/workspace/build/tests/reftest/tests/layout/reftests/w3c-css/submitted/transforms/perspective-containing-block-dynamic-1a.html" "file:///home/worker/workspace/build/tests/reftest/tests/layout/reftests/bugs/360746-1.html" "file:///home/worker/workspace/build/tests/reftest/tests/layout/reftests/bugs/490176-1.html" "file:///home/worker/workspace/build/tests/reftest/tests/layout/reftests/css-display/display-contents-acid-dyn-1.html" "file:///home/worker/workspace/build/tests/reftest/tests/layout/reftests/css-sizing/min-intrinsic-with-max-width-percents-across-form-controls.html" "file:///home/worker/workspace/build/tests/reftest/tests/layout/reftests/first-letter/dynamic-2.html" "file:///home/worker/workspace/build/tests/reftest/tests/layout/reftests/forms/input/number/not-other-type-unthemed-1.html" "file:///home/worker/workspace/build/tests/reftest/tests/layout/reftests/table-anonymous-boxes/208305-2.html" "file:///home/worker/workspace/build/tests/reftest/tests/layout/reftests/transform/dynamic-inherit-1.html" "file:///home/worker/workspace/build/tests/reftest/tests/layout/reftests/transform-3d/willchange-containing-block.html?willchange"

All the crashes mentioned in comment 0 are gone now.