Had to also use `TestUtils.waitForCondition` to reliably wait for the click-to-play notification in private windows in `browser_private_clicktoplay.js`. This should solve all the issues. Try push: https://treeherder.mozilla.org/#/jobs?repo=try&revision=ac9cc886ad2728cb3a269117a37764e96b0471d5
Bug 1531838 Comment 8 Edit History
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Had to also use `TestUtils.waitForCondition` to reliably wait for the click-to-play notification in private windows in `browser_private_clicktoplay.js`. This should solve all the issues. Try push: ~~https://treeherder.mozilla.org/#/jobs?repo=try&revision=ac9cc886ad2728cb3a269117a37764e96b0471d5~~ https://treeherder.mozilla.org/#/jobs?repo=try&revision=5901e9360a28c8937bd194b81e38a9ccb8fc9df1