Only me?
It’s not possible, the header is an additional plugin. We used a different plugin for the links in the past, but it didn’t work well on mobile devices.
EDIT
The previous one also broke often after an update of the forum software.
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I use here FF 74.0,
error comes after update from FF developer
or maybe extensions are bad.
[2020-03-21T12:22:56+0100] [ALPM] upgraded firefox-noscript (11.0.15-1 -> 11.0.19-1)
[2020-03-21T12:22:56+0100] [ALPM] upgraded firefox-extension-https-everywhere (2019.11.7-1 -> 2020.3.16-1)
[2020-03-21T12:22:56+0100] [ALPM] upgraded firefox-developer-edition-i18n-de (75.0b5-1 -> 75.0b6-1)
[2020-03-21T12:22:56+0100] [ALPM] upgraded firefox-developer-edition (75.0b5-1 -> 75.0b6-1)
Edit: Opera are fine 
Wait, I misinterpreted the question, I thought it was a suggestion. I will check it.
I don’t have it, it displays the same as in other browsers. Try logging out and in and otherwise deactivate all your FF plugins and start them one at the time.
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My fault it was the invidio. ??? thing, I mark trust in noscript and all is fine.
I could have built it as fake but I would never do that here in the forum 
@ricklinux no , it was noscript
but it is not more showing
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Are you using Cinnamon desktop? Oh you figured it out?
Is noscript an extension in Firefox?
Yes upgrade today, I start first like @Bryanpwo said check the plugins and noscript is the guilty
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