Firefox css that feels like Safari 15

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

/* 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 */
#TabsToolbar toolbarbutton,
#TabsToolbar toolbaritem,
.tabbrowser-tab,
.tab-close-button,
.tab-icon-stack{
  pointer-events: auto
}

/* Invisible capture box behind tabs*/
:root:not([customizing]) #urlbar-input-container::before{
  position: fixed;
  display: block;
  top: 0;
  left: 0;
  width: calc(100vw - 138px);
  height: calc(var(--tab-min-height) + 2*var(--tab-block-margin));
  content: "";
  pointer-events: auto;
}
:root[sizemode="normal"]:not([customizing]) #urlbar-input-container::before{ left: 40px; width: calc(100vw - 138px -80px) }

#urlbar-input-container:focus-within::before{ display: none !important; }

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

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

/* This is a horrible hack and absolutely requires click_selected_tab_to_focus_urlbar.css to work. In general it's pertty bad, but meh */

/* Also hides the nav-bar and shows main menu button next to window controls. And makes the selected tab expand a whole bunch  */

/* Whole bunch of z-indexing */
#main-window > body > box{ position: relative; z-index: 1 }
.urlbar-input-box{ z-index: -1 !important; }
#urlbar{ z-index: auto !important; }
#alltabs-button,
#PanelUI-button,
#nav-bar-overflow-button{ z-index: 2; position: relative }

:root[sizemode="normal"] #urlbar-container{ margin-inline: 40px !important; }

#urlbar-input-container > :not(.urlbar-input-box){ opacity: 0 }

#urlbar-background{
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
  outline: none !important;
}
.urlbarView{
  background: var(--toolbar-field-focus-background-color);
  border: 0px solid var(--toolbar-field-focus-border-color) !important;
  z-index: 1;
  padding: 6px;
  border-radius: 6px;
  box-shadow: 0 0 26px #000;
  left: 50vw;
  margin-left: -50% !important;
}

.tabbrowser-tab[selected][fadein]{ max-width: 100vw !important; min-width: 200px !important }

#navigator-toolbox:focus-within .tabbrowser-tab[selected] .tab-content{
  opacity: 0;
}
#navigator-toolbox:focus-within .tab-background[selected]{
  background-image: -moz-element(#urlbar-input) !important;
  background-position: calc(var(--tab-inline-padding,4px) + 6px) 3px !important;
  background-color: var(--toolbar-field-focus-background-color) !important;
  background-size: auto !important;
}

:root:not([customizing]) #titlebar{ margin-bottom: -40px }

/* Oh and! also hide other buttons from the nav-bar because why not */
#nav-bar-customization-target > :not(#urlbar-container){ visibility: collapse }
#TabsToolbar > .toolbar-items{ margin-right: 40px !important; }

#nav-bar{
  padding-right: 138px;
  box-shadow: none !important;
  background-color: transparent !important;
}

/* Back button */
#back-button {
  -moz-box-ordinal-group: 0 !important;
}

/* Forward button */
#forward-button {
  -moz-box-ordinal-group: 1 !important;
}

/* Reload button */
#reload-button {
  -moz-box-ordinal-group: 2 !important;
}

/* Stop button */
#stop-button {
  -moz-box-ordinal-group: 3 !important;
}

.titlebar-buttonbox-container{ display:none }
#nav-bar-overflow-button { display: none !important;}