diff --git a/desktop.nix b/desktop.nix
index 1ba244a..0ece904 100644
--- a/desktop.nix
+++ b/desktop.nix
@@ -154,6 +154,7 @@ in {
     # programs.gnupg.agent.pinentryFlavor = "qt";
 
     environment.systemPackages = with pkgs; [
+      myFirefox
       chromium
       p7zip
       vlc
diff --git a/overlays.nix b/overlays.nix
index c3ab6d5..1ba2494 100644
--- a/overlays.nix
+++ b/overlays.nix
@@ -121,6 +121,8 @@ in
           enableWideVine = true;
         };
         # chromium = self.ungoogled-chromium;
+
+        myFirefox = (import ./packages/firefox.nix { pkgs = self; inherit lib; });
       })
     ];
 
diff --git a/packages/firefox.nix b/packages/firefox.nix
new file mode 100644
index 0000000..50ebe05
--- /dev/null
+++ b/packages/firefox.nix
@@ -0,0 +1,75 @@
+{pkgs, lib,
+...
+}:
+with lib;
+let
+  genPrefList = {locked ? false}: prefs: concatStringsSep "\n" (
+                      mapAttrsToList
+                        (key: value: ''lockPref(${toString key}, ${builtins.toJSON value});'')
+                        prefs
+                );
+in pkgs.wrapFirefox pkgs.firefox-esr-unwrapped {
+    cfg = {
+      smartcardSupport = true;
+      enablePlasmaBrowserIntegration = true;
+    };
+
+    extraPolicies = {
+      CaptivePortal = true;
+      DisableFirefoxStudies = true;
+      DisablePocket = true;
+      DisableTelemetry = true;
+      DisableFirefoxAccounts = false;
+      FirefoxHome = {
+        Pocket = false;
+        Snippets = false;
+      };
+      HardwareAcceleration = true;
+      UserMessaging = {
+        ExtensionRecommendations = false;
+        SkipOnboarding = true;
+        WhatsNew = false;
+        MoreFromMozilla = false;
+      };
+      SSLVersionMin = "tls1.2";
+      SearchSuggestEnabled = true;
+      SearchEngines = {
+        Add = [
+          {
+            Name = "DuckDuckGo";
+            URLTemplate = "https://duckduckgo.com/?kp=1&k1=-1&kak=-1&kax=-1&kau=-1&kae=d&kaj=m&kam=osm&kav=1&kf=fw&q={searchTerms}";
+            Method = "GET";
+            IconURL = "https://duckduckgo.com/favicon.png";
+            Description = "Your privacy, simplified";
+          }
+        ];
+        Default = "DuckDuckGo";
+      };
+      SupportMenu = {
+        Title = "Support";
+        URL = "mailto:antoine@lesviallon.fr";
+        AccessKey = "S";
+      };
+      Extensions = {
+        Install = [
+          "uBlock0@raymondhill.net"
+        ];             
+      };
+      ExtensionSettings = {
+        "uBlock0@raymondhill.net" = {
+          installation_mode = "force_installed";
+          install_url = "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi";
+        };
+      };
+      ExtensionUpdate = true;
+    }; 
+
+    extraPrefs = genPrefList { locked = true; } {
+      "intl.accept_languages" = "";
+      "widget.use-xdg-desktop-portal" = true;
+      "dom.event.contextmenu.enabled" = true;
+      "network.IDN_show_punycode" = true;
+      "plugins.enumerable_names" = true;
+      "security.identityblock.show_extended_validation" = true;
+    };
+  }