fenix-fox/chrome/click_selected_tab_to_focus_urlbar.css

/* Clicking selected tab selects focuses urlbar */
/* Selected tab cannot be normally clicked (right-,middle- or left-clicked) EXCEPT from the tab icon */

/* Clicking selected pinned tab doesn't focus urlbar by default since I expect you might not want to change pinned tab address - see below */


/* Make selected tab unclickable so click goes to the capture box, obviously it can't be clicked at all anymore */
/* remove the :not([pinned]) bit to make clicking pinned tab AROUND the tab-icon focus urlbar*/

.tabbrowser-tab:not([pinned])[selected]{ pointer-events: none }

/* Add back pointer-events to several elements so UI remains usable */
/* The selected tab can be clicked normally from the icon */
#tabbrowser-tabs toolbarbutton,
.tabbrowser-tab,
.tabbrowser-tab .tab-close-button,
.tabbrowser-tab .tab-icon-image{
  pointer-events: auto
}

/* Invisible capture box behind tabs*/
:root:not([customizing]) #urlbar::before{
  position: fixed;
  display: block;
  top: 0;
  left: 0;
  width: calc(100vw - 138px);
  height: var(--tab-min-height);
  content: "";
}

/* Make tabs appear over the invisible box */
:root:not([customizing]) #tabbrowser-tabs{
  position: relative;
  z-index: 1;
  pointer-events: none
}