[Bug 1821552] Prefs.txt

[Stephen Waines]

apport information

** Attachment added: "Prefs.txt"
   https://bugs.launchpad.net/bugs/1821552/+attachment/5252313/+files/Prefs.txt

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Title:
  Ubuntu 19.04 Desktop:mouseover preview of option in firefox and
  mozilla not legible

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