I have verified this issue with the latest Firefox Nightly (69.0a1 Build ID - 20190602221035) installed, on Windows 10 x64, Arch Linux and Mac 10.14.5 using [these steps](https://github.com/mozilla/activity-stream/pull/5043#issue-280042677) and I have not observed any regression.
Bug 1550160 Comment 3 Edit History
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I have verified this issue with the latest Firefox Nightly (69.0a1 Build ID - 20190602221035) installed, on Windows 10 x64, Arch Linux and Mac 10.14.5 using [these steps](https://github.com/mozilla/activity-stream/pull/5043#issue-280042677) and I have not observed any regressions.