1{ config
 2, pkgs
 3, ...
 4}:
 5
 6{
 7  programs.firefox = {
 8    enable = true;
 9    profiles = {
10      icy = {
11        isDefault = true;
12        path = "34x366wc.default";
13        userChrome = ''
14          #sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] #sidebar-header {
15            display: none;
16          }
17
18          #main-window[tabsintitlebar="true"]:not([extradragspace="true"]) #TabsToolbar > .toolbar-items {
19            opacity: 0;
20            pointer-events: none;
21          }
22          #main-window:not([tabsintitlebar="true"]) #TabsToolbar {
23              visibility: collapse !important;
24          }
25        '';
26      };
27    };
28  };
29}