This bug is only in Firefox 52.9.0 (32-bit). In Hromium and Maxthon – ok.
If you make the Firefox browser narrower, then when you hover the mouse, a submenu opens itself. although the submenu should open on click.
if you move the mouse away, the submenu items disappear, and the space under them remains.
if you move the mouse to the next menu item, then the menu starts to jerk.
it is impossible to close the submenu by clicking. as well as open.
however, if you use a smartphone emulation in Firefox 52.9.0 (32-bit), then there is no such error. everything works perfectly.
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