How do I remove the background display in the upper and lower parts of the page?

November 30

The upper and lower ends have a background display when a new version was updated.I wish to remove the display.
== This happened ==
Every time Firefox opened
== Today



Sounds that you installed a Persona.
You can uninstall that Persona and revert to the ''Default'' theme (Tools > Add-ons > Themes).
See [[Using themes with Firefox]] and (Lightweight theme)

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