diff --git a/hosts/common/default.nix b/hosts/common/default.nix
index e08c19c..5943752 100644
--- a/hosts/common/default.nix
+++ b/hosts/common/default.nix
@@ -186,45 +186,192 @@ in
   '';
   system.activationScripts.dconfUpdate.text = "${pkgs.dconf}/bin/dconf update";
 
-  # Confidentialité générique (pas de SearXNG/DNS perso : repo public).
+  # Reprend la config Firefox d'oreo (nixos_users/hosts/oreo/configuration.nix)
+  # -- c'est elle qui tue la page d'accueil/configuration au premier
+  # lancement (aboutwelcome, newtabpage...) et bloque les pubs/contenu
+  # sponsorisé bien plus largement que l'ancienne version ici (qui ne
+  # coupait que le strict showSponsored). Deux choses changées par
+  # rapport à oreo, volontairement : SearXNG (perso, privé) remplacé par
+  # DuckDuckGo (public, intégré à Firefox) ; ExtensionSettings réduit à
+  # uBlock Origin + Privacy Badger (oreo en a une quinzaine, trop pour
+  # un poste générique de flotte).
   programs.firefox = {
     enable = true;
     languagePacks = [ "fr" ];
 
     preferences = {
+      "browser.startup.homepage" = "https://duckduckgo.com";
       "privacy.resistFingerprinting" = true;
-      "browser.newtabpage.activity-stream.showSponsored" = false;
+
+      "network.trr.mode" = 3;
+      "network.trr.uri" = "https://dns.quad9.net/dns-query";
+      "network.trr.fallback-resolver" = "https://mozilla.cloudflare-dns.com/dns-query";
+
+      "browser.newtabpage.enabled" = false;
+      "browser.newtabpage.activity-stream.enabled" = false;
+      "browser.startup.page" = 1;
+
+      # Page de configuration/bienvenue au premier lancement -- désactivée.
+      "browser.aboutwelcome.enabled" = false;
+      "browser.newtabpage.pinned" = "[]";
+      "browser.newtabpage.section.discovery" = false;
+
+      "places.history.enabled" = false;
+      "privacy.clearOnShutdown.history" = true;
+      "privacy.clearOnShutdown.cache" = true;
+      "privacy.clearOnShutdown.downloads" = true;
+      "privacy.clearOnShutdown.cookies" = false;
+      "privacy.clearOnShutdown.sessions" = false;
+      "privacy.clearOnShutdown.formdata" = false;
+      "privacy.clearOnShutdown.offlineApps" = true;
+
+      # Onglets verticaux à gauche par défaut
+      "sidebar.revamp" = true;
+      "sidebar.verticalTabs" = true;
+
+      # Virer "Recent browsing" (Firefox View)
+      "browser.tabs.firefox-view" = false;
+      "browser.tabs.firefox-view-next" = false;
+
+      # Virer "List all tabs" (bouton chevron dropdown)
+      "browser.tabs.tabmanager.enabled" = true;
+
+      # Virer suggestions de recherche (y compris tendances)
       "browser.search.suggest.enabled" = false;
+      "browser.urlbar.suggest.searches" = false;
+      "browser.urlbar.suggest.trending" = false;
+      "browser.newtabpage.activity-stream.showSponsored" = false;
+
+      # HTTPS obligatoire en permanence
       "dom.security.https_only_mode" = true;
+      "dom.security.https_only_mode_ever_enabled" = true;
+
+      # Désactiver WebRTC (fuite d'IP réelle même via VPN)
       "media.peerconnection.enabled" = false;
+
+      # Désactiver la géolocalisation
       "geo.enabled" = false;
+
+      # Désactiver DRM (Widevine)
+      "media.eme.enabled" = false;
+
+      # Désactiver le prefetching (DNS/liens) — fuite d'intention de navigation
+      "network.dns.disablePrefetch" = true;
+      "network.prefetch-next" = false;
+      "network.predictor.enabled" = false;
+      "network.http.speculative-parallel-limit" = 0;
+
+      # Désactiver Safe Browsing distant (envoie des hachages d'URL à Google)
+      "browser.safebrowsing.malware.enabled" = false;
+      "browser.safebrowsing.phishing.enabled" = false;
+
+      # Désactiver la détection de portail captif (requête réseau vers Mozilla)
       "network.captive-portal-service.enabled" = false;
+      "network.connectivity-service.enabled" = false;
+
+      # Isolation par premier-parti (empêche le cross-site tracking via cache/cookies)
+      "privacy.firstparty.isolate" = true;
+
+      # Désactiver WebGL (vecteur de fingerprinting majeur)
+      "webgl.disabled" = true;
+
+      # Désactiver l'API batterie (fingerprinting)
+      "dom.battery.enabled" = false;
+
+      # Bloquer l'autoplay média
+      "media.autoplay.default" = 5;
+
+      # Référent minimal envoyé aux sites
+      "network.http.referer.XOriginPolicy" = 2;
+
       # Do Not Track : plus d'UI depuis les versions récentes de Firefox,
       # mais le pref existe encore et envoie bien l'en-tête DNT=1.
       "privacy.donottrackheader.enabled" = true;
     };
 
     policies = {
-      DisableTelemetry = true;
-      DisablePocket = true;
       DisableFirefoxStudies = true;
-      OfferToSaveLogins = false;
-      DontCheckDefaultBrowser = true;
-      EnableTrackingProtection = {
-        Value = true;
-        Locked = true;
+      DisableFirefoxAccounts = false;
+      DisableFirefoxScreenshots = true;
+      DisableForgetButton = true;
+      DisableMasterPasswordCreation = true;
+      DisableProfileImport = true;
+      DisableProfileRefresh = true;
+      DisableSetDesktopBackground = true;
+      DisablePocket = true;
+      DisableTelemetry = true;
+      DisableFormHistory = true;
+      DisablePasswordReveal = true;
+      SanitizeOnShutdown = false;
+      GenerativeAI.Enable = false;
+
+      FirefoxSuggest = {
+        WebSuggestions = false;
+        SponsoredSuggestions = false;
+        ImproveSuggest = false;
       };
 
-      # DuckDuckGo est un moteur intégré à Firefox, pas besoin de l'Add.
-      SearchEngines.Default = "DuckDuckGo";
-
-      # Pubs/contenu sponsorisé sur le nouvel onglet et la barre d'adresse.
       FirefoxHome = {
         SponsoredTopSites = false;
         SponsoredPocket = false;
+        TopSites = false;
+        Highlights = false;
+        Pocket = false;
+        Snippets = false;
         Locked = true;
       };
-      FirefoxSuggest.SponsoredSuggestions = false;
+
+      UserMessaging = {
+        WhatsNew = false;
+        MoreFromMozilla = false;
+      };
+
+      EnableTrackingProtection = {
+        Value = true;
+        Locked = true;
+        Cryptomining = true;
+        Fingerprinting = true;
+      };
+
+      BlockAboutConfig = false;
+      BlockAboutProfiles = false;
+      BlockAboutSupport = false;
+
+      DontCheckDefaultBrowser = true;
+      HardwareAcceleration = true;
+      OfferToSaveLogins = false;
+      DefaultDownloadDirectory = "$HOME/Downloads";
+      PromptForDownloadLocation = true;
+      DisplayBookmarksToolbar = "never";
+
+      Preferences = {
+        "privacy.globalprivacycontrol.enabled" = {
+          Value = true;
+          Status = "locked";
+        };
+        "privacy.globalprivacycontrol.functionality.enabled" = {
+          Value = true;
+          Status = "locked";
+        };
+      };
+
+      # DuckDuckGo est un moteur intégré à Firefox, pas besoin de l'Add.
+      Homepage = {
+        URL = "https://duckduckgo.com";
+        Locked = true;
+        StartPage = "homepage";
+      };
+      SearchEngines = {
+        Default = "DuckDuckGo";
+        PreventInstalls = true;
+      };
+
+      "browser.aboutConfig.showWarning" = {
+        Value = false;
+        Status = "locked";
+      };
+
+      NewTabPage = false;
 
       ExtensionSettings = {
         "uBlock0@raymondhill.net" = {