[Bug 1987976]

[Release-mgmt-account-bot]

The severity field is not set for this bug.
:gerard-majax, could you have a look please?

For more information, please visit [auto_nag
documentation](https://wiki.mozilla.org/Release_Management/autonag#workflow.2Fno_severity.py).

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https://bugs.launchpad.net/bugs/1987976

Title:
  firefox black window

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