Firefox Vertical Tabs

Firefox Vertical Tabs Setup

Image showing vertical tabs in Firefox


Tree Style Tabs


First, in about:config, you’ll need to change the value of toolkit.legacyUserProfileCustomizations.stylesheets to true.

Then you’ll need to open the “Profile Directory” by clicking on the menu -> help -> troubleshooting information.

Once that folder is open, create a folder called chrome inside if it doesn’t already exist.

Inside the chrome folder, create or edit the userChrome.css file and add the following:

/* Hide main tabs toolbar */
#main-window[tabsintitlebar='true']:not([extradragspace='true']) #TabsToolbar > .toolbar-items {
  opacity: 0;
  pointer-events: none;
#main-window:not([tabsintitlebar='true']) #TabsToolbar {
  visibility: collapse !important;

/* Hide splitter, when using Tree Style Tab. */
#sidebar-box[sidebarcommand='treestyletab_piro_sakura_ne_jp-sidebar-action'] + #sidebar-splitter {
  display: none !important;
/* Hide sidebar header, when using Tree Style Tab. */
#sidebar-box[sidebarcommand='treestyletab_piro_sakura_ne_jp-sidebar-action'] #sidebar-header {
  visibility: collapse;

/* Adding empty space for buttons */
#nav-bar {
  margin-right: 140px;

/* 15px for dragging whole window by mouse*/
#titlebar {
  appearance: none !important;
  height: 15px;

/* Fix for main menu calling by Alt button */
#titlebar > #toolbar-menubar {
  margin-top: 10px;

/* Move minimize/restore/close buttons to empty space */
#TabsToolbar > .titlebar-buttonbox-container {
  display: block;
  position: absolute;
  top: 17px;
  right: 1px;

Custom Colours

Next edit the userContent.css file to add some custom colours:

@-moz-document regexp("moz-extension://.+/sidebar/sidebar.html.*")
  #background {
    background-color: rgb(
    ); /* https://github.com/piroor/treestyletab/blob/0eede581d763f92344fe64b1c042839f3b8ca955/webextensions/resources/ui-color.css#L198 */

Changing the Shortcut

Edit the shortcut to allow Tree Style Tabs to be toggled with Ctrl + Space (or anything you like).

Steps to change the keybind Showing shortcut set

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