This test was actually marked as disabled for CCOV on Windows via bug 1495002 (see comment 11) and as such the bug shouldn't have been closed. I'll get the test re-enabled along with my changes for bug 1741802.
Bug 1524813 Comment 20 Edit History
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This [test was actually marked as disabled for CCOV on Windows](https://searchfox.org/mozilla-central/rev/bc5e79f3ae0f42cb4a6ebd05fc32f48a3829059d/testing/web-platform/meta/webdriver/tests/permissions/set.py.ini#2-3) via bug 1495002 (see comment 11) and as such the bug shouldn't have been closed. I'll get the test re-enabled along with my changes for bug 1741802.