Though I am not sure this is a right component for this issue. From a log  on our CI, po-disconnect.any.html and po-disconnect.any.worker.html run without timeout, but the expectation data file annotates  their timeout. I did confirm that both of tests work fine without the expectation data. https://treeherder.mozilla.org/#/jobs?repo=try&revision=2b7f7d82a2e01b71a96953cd4f0029cc5e9a1bf2  https://public-artifacts.taskcluster.net/W8iKvfMtSh-R8pd9U873XQ/0/public/logs/live_backing.log  https://hg.mozilla.org/mozilla-central/file/14eea6bedcf3/testing/web-platform/meta/performance-timeline/po-disconnect.any.js.ini
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