mobile-config-firefox/chrome/drag_window_from_urlbar.css

/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/drag_window_from_urlbar.css made available under Mozilla Public License v. 2.0
See the above repository for updates as well as full license text. */

/* Makes the window draggable from urlbar when urlbar is not focused. This means you can't click the urlbar text to activate it normally. But right-click works to activate urlbar. */

.urlbar-input-box,#urlbar-input,#urlbar-scheme,#urlbar-container{
  -moz-window-dragging: drag;
  cursor: default;
}
#urlbar-input-container > box,
#page-action-buttons,
#urlbar-container:focus-within,
#urlbar-container:focus-within :is(.urlbar-input-box,#urlbar-input,#urlbar-scheme,#urlbar-container){
  -moz-window-dragging: no-drag;
  cursor: auto;
}