nixos/apps/firefox/profiles/web-app.nix

{
  pkgs,
  myConfig,
  id,
  name,
  url,
  ...
}: {
  inherit id name;
  search.force = true;
  search.default = "ddg";
  extensions.force = true;
  extensions.packages = with pkgs.nur.repos.rycee.firefox-addons; [
    ublock-origin
    bitwarden
    tridactyl
  ];

  settings = {
    # --- Privacy & Hardening ---
    "browser.contentblocking.category" = "strict";
    "privacy.trackingprotection.enabled" = true;
    "privacy.resistFingerprinting" = true; # Note: Spoofs timezone and caps FPS to 60
    "geo.enabled" = false;
    "media.peerconnection.enabled" = false; # Prevents WebRTC IP leaks
    "network.dns.disablePrefetch" = true;
    "network.prefetch-next" = false;

    # --- NixOS / Hyprland Integration ---
    "widget.use-xdg-desktop-portal.file-picker" = 1; # Use native file picker

    # --- UI & Behavior ---
    "browser.compactmode.show" = true;
    "browser.tabs.closeWindowWithLastTab" = false;
    "extensions.pocket.enabled" = false;
    "extensions.screenshots.disabled" = true;
    "browser.topsites.contile.enabled" = false;
    "browser.formfill.enable" = false;
    "browser.search.suggest.enabled" = false;
    "browser.search.suggest.enabled.private" = false;
    "browser.urlbar.suggest.searches" = false;
    "browser.urlbar.showSearchSuggestionsFirst" = false;
    "browser.newtabpage.activity-stream.feeds.section.topstories" = false;
    "browser.newtabpage.activity-stream.feeds.snippets" = false;
    "browser.newtabpage.activity-stream.section.highlights.includePocket" = false;
    "browser.newtabpage.activity-stream.section.highlights.includeBookmarks" = false;
    "browser.newtabpage.activity-stream.section.highlights.includeDownloads" = false;
    "browser.newtabpage.activity-stream.section.highlights.includeVisited" = false;
    "browser.newtabpage.activity-stream.showSponsored" = false;
    "browser.newtabpage.activity-stream.system.showSponsored" = false;
    "browser.newtabpage.activity-stream.showSponsoredTopSites" = false;
    "toolkit.legacyUserProfileCustomizations.stylesheets" = true;
    "extensions.autoDisableScopes" = 0; # Enable extensions by default

    # --- Homepage & Navigation ---
    "browser.startup.page" = 1; # Always open the homepage
    "browser.startup.homepage" = url;
    "browser.newtab.url" = url; # Try to set newtab to homepage
    "browser.sessionstore.resume_from_crash" = false; # Always start fresh
    "browser.sessionstore.max_tabs_undo" = 0; # Disable undo close tab

    # --- DNS over HTTPS (Quad9) ---
    "network.trr.mode" = 2; # Use DoH with system fallback
    "network.trr.uri" = "https://dns.quad9.net/dns-query";
  };

  userChrome = ''
    /* --- Autohide Entire Toolbox (Tabs + Address Bar) --- */
    /* Adapted from MrOtherGuy's autohide_main_toolbar.css */

    :root{
      /* Height of Tabs + Nav Bar approx 80px */
      --uc-navbar-transform: -85px; 
      --uc-autohide-toolbar-delay: 0.1s;
      --uc-autohide-toolbar-duration: 200ms;
    }
    :root[uidensity="compact"]{ --uc-navbar-transform: -70px }

    #navigator-toolbox > div{ display: contents; }
    
    /* Apply transform to TabsToolbar AND Nav-bar */
    :root[sessionrestored] :where(#nav-bar,#PersonalToolbar,#TabsToolbar,#tab-notification-deck,.global-notificationbox,#notifications-toolbar){
      transform: translateY(var(--uc-navbar-transform))
    }
    
    :root:is([customizing],[chromehidden*="toolbar"]) :where(#nav-bar,#PersonalToolbar,#TabsToolbar,#tab-notification-deck,.global-notificationbox,#notifications-toolbar){
      transform: none !important;
      opacity: 1 !important;
    }

    /* Hide styles for Nav-Bar AND TabsToolbar */
    :where(#nav-bar,#TabsToolbar):not([customizing]){
      opacity: 0;
      transition:  transform var(--uc-autohide-toolbar-duration) ease var(--uc-autohide-toolbar-delay), opacity var(--uc-autohide-toolbar-duration) ease var(--uc-autohide-toolbar-delay) !important;
      position: relative;
      z-index: 2;
      background-color: #1c1b22 !important; /* Solid background */
    }

    #navigator-toolbox,
    #sidebar-box,
    #sidebar-main,
    #sidebar-splitter,
    #tabbrowser-tabbox{
      z-index: auto !important;
    }

    /* Show when toolbox is focused or hovered */
    #navigator-toolbox:focus-within > .browser-toolbar,
    .browser-titlebar:hover ~ :is(#nav-bar,#PersonalToolbar,#TabsToolbar),
    #nav-bar:hover,
    #TabsToolbar:hover,
    #nav-bar:hover + #PersonalToolbar{
      transform: translateY(0);
      opacity: 1;
      transition-duration: var(--uc-autohide-toolbar-duration), var(--uc-autohide-toolbar-duration) !important;
      transition-delay: 0s !important;
    }

    /* Ensure popups still work (URL bar) */
    :root[sessionrestored] #urlbar[popover]{
      opacity: 0;
      pointer-events: none;
      transition: transform var(--uc-autohide-toolbar-duration) ease var(--uc-autohide-toolbar-delay), opacity var(--uc-autohide-toolbar-duration) ease var(--uc-autohide-toolbar-delay);
      transform: translateY(var(--uc-navbar-transform));
    }
    #mainPopupSet:has(> [panelopen]:not(#ask-chat-shortcuts,#selection-shortcut-action-panel,#chat-shortcuts-options-panel,#tab-preview-panel)) ~ toolbox #urlbar[popover],
    .browser-titlebar:is(:hover,:focus-within) ~ #nav-bar #urlbar[popover],
    #nav-bar:is(:hover,:focus-within) #urlbar[popover],
    #urlbar-container > #urlbar[popover]:is([focused],[open]){
      opacity: 1;
      pointer-events: auto;
      transition-delay: 0ms;
      transform: translateY(0);
    }
    :where(:root[sessionrestored]) #urlbar-container > #urlbar[popover]:is([focused],[open]){
     transition-duration: 100ms;
    }

    /* --- CRITICAL FIX: Trigger Zone --- */
    /* Since we hide EVERYTHING, we need a hitbox at the top of the screen */
    #navigator-toolbox::after {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 20px; /* Generous hit target */
      z-index: 10000;
      pointer-events: auto;
    }
    
    /* When hitbox is hovered, reveal bars */
    #navigator-toolbox:hover :where(#nav-bar,#PersonalToolbar,#TabsToolbar) {
      transform: translateY(0) !important;
      opacity: 1 !important;
      transition-delay: 0s !important;
    }

    /* Move up the content view to fill the gap */
    :root[sessionrestored]:not([chromehidden~="toolbar"]) > body > #browser{
      margin-top: var(--uc-navbar-transform);
    }

    /* Fix Titlebar and Bookmarks */
    #titlebar { appearance: none !important; }
    #PersonalToolbar { visibility: collapse !important; }
  '';
}