This became frequent after the changes in Bug 1852442 https://treeherder.mozilla.org/jobs?repo=autoland&searchStr=Linux%2C18.04%2Cx64%2CWebRender%2Cdebug%2CMochitests%2Cwith%2Cnetworking%2Con%2Csocket%2Cprocess%2Ctest-linux1804-64-qr%2Fdebug-mochitest-browser-chrome-spi-nw%2Cbc10&tochange=0083ca2f4709e599083520545d538d1ee1b8356d&fromchange=96fef7ee7351c443537210f8f9b860e0e1ed1eb3&group_state=expanded&selectedTaskRun=cbLze_WeQVGRlyexpt3zxQ.0.
Bug 1863797 Comment 14 Edit History
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This became frequent after the changes in Bug 1852442 - backfills [here](https://treeherder.mozilla.org/jobs?repo=autoland&searchStr=Linux%2C18.04%2Cx64%2CWebRender%2Cdebug%2CMochitests%2Cwith%2Cnetworking%2Con%2Csocket%2Cprocess%2Ctest-linux1804-64-qr%2Fdebug-mochitest-browser-chrome-spi-nw%2Cbc10&tochange=0083ca2f4709e599083520545d538d1ee1b8356d&fromchange=96fef7ee7351c443537210f8f9b860e0e1ed1eb3&group_state=expanded&selectedTaskRun=cbLze_WeQVGRlyexpt3zxQ.0).