[Bug] slider on mobile dashboard display issue in Firefox

Successor of https://github.com/galadril/Domoticz-Nightglass-Theme/issues/178 but I am not allowed to reopen it. Recap: when dynamic dashboard is in use, the mobile dashboard based on favorites has an issue with a dimmer slider. It will disappear when scrolling the dashboard page. New findings: this is a Firefox issue as in Chrome it is working fine. Also in Chrome the layout seems more condense and better usable. Please make Firefox dashboard look more as in Chrome. See the below screenshots. The issue of slider (also lot of space) in Firefox Dashboard in Firefox Dashboard in Chrome