I went to land this today to fix bct7 on comm-beta, and it turns out this patch was actually landed on beta during the last merge, but for some reason browser_darkReader.js is still failing universally on beta with a [similar failure log](https://treeherder.mozilla.org/logviewer?job_id=482496649&repo=comm-beta&lineNumber=3002).
Bug 1927281 Comment 9 Edit History
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I went to land this on comm-beta to fix bct7 today, and it turns out this patch was actually landed on beta during the last merge, but for some reason browser_darkReader.js is still failing universally on beta with a [similar failure log](https://treeherder.mozilla.org/logviewer?job_id=482496649&repo=comm-beta&lineNumber=3002).