userChrome.css

:root {
  --sidebar-width: 196px;
  --toolbar-height: -26px;
  --urlbar-icon-padding: 5px !important;
  --toolbarbutton-border-radius: 0 !important;
}

.browser-toolbar {
  background-color: -moz-Field !important;
}

toolbar#nav-bar {
  margin-left: var(--sidebar-width);
  background-image: none !important;
  z-index: 10;
}

toolbaritem#urlbar-container, toolbaritem#search-container {
  margin-inline: 0 !important;
  -moz-box-align: start !important;
  padding: 0 0 !important;
}

#searchbar {
  border-top: 0 !important;
  border-bottom: 0 !important;
}

#urlbar, .searchbar-textbox {
  min-height: 26px !important;
  margin: 0 !important;
  border: none !important;
  border-left: 1px solid ThreeDShadow !important;
  border-radius: 0 !important;
}

.searchbar-textbox {
  margin-top: -1px !important;
  margin-bottom: -1px !important;
  border-left: 0 !important;
}

#PanelUI-button, #nav-bar-overflow-button {
 max-height: 26px;
}

/* fix bookmarks toolbar */
#main-window #PersonalToolbar {
  background-image: none !important;
  z-index: 1 !important;
  position: relative !important;
  margin-left: 0 !important;
  margin-top: var(--toolbar-height) !important;
  padding: 0 !important;
  min-height: var(--toolbar-height) !important;
}

toolbarbutton.bookmark-item {
  border-radius: 0 !important;
  margin: 0 !important;
  padding: 5px 6px !important;
}

/* lock sidebar to height by doing the inverse margin of the toolbar element */
#sidebar-box {
  z-index: 1000 !important;
  position: relative !important;
}

/* lock sidebar to specified width */
#sidebar-box, #sidebar-box #sidebar {
    min-width: var(--sidebar-width) !important;
    max-width: var(--sidebar-width) !important;
}

/* cosmetic changes only */

#back-button { visibility: collapse; }
#forward-button { visibility: collapse; }
#TabsToolbar { visibility: collapse; }
#sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] #sidebar-header {
  display: none;
}
/* Sidebery */
#sidebar-box[sidebarcommand="_3c078156-979c-498b-8990-85f7987dd929_-sidebar-action"] #sidebar-header {
  display: none;
}
#sidebar-box[sidebarcommand="verticaltabsreloaded_go-dev_de-sidebar-action"] > #sidebar-header {
  visibility: collapse;
}

.sidebar-splitter {
  width: 0 !important;
  border: none !important;
  border-right: 1px solid ThreeDShadow !important;
  cursor: default !important
}

weird, mine does not highlight the address bar and it auto completes a url when typing a key, can you check?