The Horizontal Scroll bar is missing on view prepare step in Firefox, its present when using Chrome
Using Firefox v59.0.2
YF v7.4 build 20180313
Please check the zoom level in firefox.
From your screen shot it looks like the page is zoomed. This can cause unpredicatble actions and effects with the client side code.
I hope this helps,
I missed that thanks, zoom was set to 90%
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