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Sydney theme is suddenly scrolling differently in Firefox: When scrolling up, the header picture will move upwards and the body is stretched. It’s like Firefox is “pulling the wrong strings”.
In Safari and Chrome instead, when scrolling up, the body will come up and smoothly slide over the header picture, like it is supposed to do.
You can try in the theme preview https://de.wordpress.org/themes/sydney/.
So why is this issue with Firefox?