1{ config
 2, pkgs
 3, ...
 4}:
 5
 6
 7# XXX: Make sure to enable toolkit.legacyUserProfileCustomizations.stylesheets in about:config.
 8{
 9  programs.firefox = {
10    enable = true;
11    profiles = {
12      icy = {
13        isDefault = true;
14        path = "34x366wc.default";
15        userChrome = ''
16          #sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] #sidebar-header {
17            display: none;
18          }
19
20          #main-window[tabsintitlebar="true"]:not([extradragspace="true"]) #TabsToolbar > .toolbar-items {
21            opacity: 0;
22            pointer-events: none;
23          }
24          #main-window:not([tabsintitlebar="true"]) #TabsToolbar {
25              visibility: collapse !important;
26          }
27        '';
28      };
29    };
30  };
31}