We do use webkit prefixed scroll bar styling - that takes effect in chromium based browsers regardless of OS. The same should be done in case of FireFox.

The z-select component, developed in ZBX-17877 fixed FF case, by adding extra right padding on list items. That fixed issue in FF(linux) but not in FF(Windows).

Instead – the above described changes should be reverted and scroll bar styles should be fixed.

• pay attention to various themes
• check if possible to override system scrollbar in Safari, else add extra padding only if needed.

The initial issue is observed in this screenshot (z-select component in FF in Windows):

The proposed fix is to update scrollbar style system wide.

For comparison, below see how current FF(linux) and Chrome(linux) renders system overview widget:

Useful links:

• https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Scrollbars