Investigate differences in Leaflet zoom-in/zoom-out buttons.

[louh]

For some reason, the zoom controls are always displayed as the "touch" variety (they're slightly larger, with a different border style) in Chrome, and the "normal" variety (they're smaller) in Firefox. This means that the position and sizing of the zoom control can be different from the search button:

In Chrome:

In Firefox:

This seems to be related to the old You Cannot Detect A Touchscreen problem, as confirmed via this issue Leaflet/Leaflet#5266. One solution may be to override Leaflet or Leaflet's stylesheet to apply touch-styles at all times.