Different menulist-related tests fail on Windows, it would seem: https://treeherder.mozilla.org/jobs?repo=try&revision=92877c982eb7b424d383c371e4061a1c54dc8bb9&selectedTaskRun=QNrnigXUQ5e5SZQChV_M2Q.0 .
Bug 1701347 Comment 4 Edit History
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Different menulist-related tests fail on Windows, it would seem: https://treeherder.mozilla.org/jobs?repo=try&revision=92877c982eb7b424d383c371e4061a1c54dc8bb9&selectedTaskRun=QNrnigXUQ5e5SZQChV_M2Q.0 . Edit: and perhaps worth noting that this doesn't include the context menu changes so the display of the menulist popup itself on Windows should be the same as before.