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blank bar gmail

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When I open gmail there is a blank bar at the top of the webpage, my theme is black so I was able to notice the issue, you can check the screenshot, is there a way to fix it?

When I open gmail there is a blank bar at the top of the webpage, my theme is black so I was able to notice the issue, you can check the screenshot, is there a way to fix it?
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Hola, No me ocurre ese problema, tienes el tema oscuro que viene en el Firefox por default ? hay alguna modificación del Firefox usando el archivo userChrome.css ? Gracias

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Currently I'm using "Solid Black (manjaro) Theme", as far as I know, it shouldn't mess with userChrome.css. In fact I edited a bit the theme but just colors, nothing else. To verify I changed to the default theme but the problem persist.

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Hola, Este es el foro en Español. Si tienes archivo userChrome.css deberías probar deshabilitandolo, de lo contrario solo queda probar Restableciendo el Firefox: https://support.mozilla.org/es/kb/restablecer-firefox-una-forma-facil-de-solucionar- Saludos