Bug 1765907 Comment 11 Edit History

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Backed out for causing mochitest failures on browser_privatebrowsing_focus_promo.js
* [Backout link](https://hg.mozilla.org/integration/autoland/rev/c5bf541cadbfd3e7981de3eb0752c32b02bf67b6)
* [Push with failures](https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&fromchange=74fd29f80fe3f60cc90289633c461c7dd76a85aa&searchStr=linux%2C18.04%2Cx64%2Cwebrender%2Ctsan%2Copt%2Cmochitests%2Cwith%2Csoftware%2Cwebrender%2Cwith%2Cfission%2Cenabled%2Ctest-linux1804-64-tsan-qr%2Fopt-mochitest-browser-chrome-swr-fis-e10s%2Cbc23&tochange=9c96649270da3464968bba33ba2a4abc08647d16&selectedTaskRun=c8U8X5cfR2uSXgio2ascDw.0) 
* Failure line: TEST-UNEXPECTED-FAIL | browser/components/privatebrowsing/test/browser/browser_privatebrowsing_focus_promo.js | Focus promo is shown for allowed region - null == true - got null, expected true (operator ==)

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