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    package = pkgs.wrapFirefox pkgs.firefox-unwrapped {
12      forceWayland = true;
13      extraPolicies = {
14        ExtensionSettings = { };
15      };
16    };
17    profiles = {
18      icy = {
19        isDefault = true;
20        path = "34x366wc.default";
21        userChrome = ''
22          #sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] #sidebar-header {
23            display: none;
24          }
25
26          #main-window[tabsintitlebar="true"]:not([extradragspace="true"]) #TabsToolbar > .toolbar-items {
27            opacity: 0;
28            pointer-events: none;
29          }
30          #main-window:not([tabsintitlebar="true"]) #TabsToolbar {
31              visibility: collapse !important;
32          }
33        '';
34      };
35    };
36  };
37}