diff --git a/desktop-environment/browser.nix b/desktop-environment/browser.nix
index c465dc4..ab0ef23 100644
--- a/desktop-environment/browser.nix
+++ b/desktop-environment/browser.nix
@@ -52,6 +52,62 @@
                     install_url = "https://addons.mozilla.org/firefox/downloads/latest/video-downloadhelper/latest.xpi";
                 };
             };
+            Preferences = {
+              # Tracking Protection
+              "browser.contentblocking.category" = "strict";
+              "privacy.trackingprotection.enabled" = true;
+              "privacy.trackingprotection.socialtracking.enabled" = true;
+
+              # Cookies
+              "network.cookie.cookieBehavior" = 1; # block third-party cookies
+
+              # Fingerprinting Protection
+              "privacy.resistFingerprinting" = true;
+              "privacy.resistFingerprinting.block_mozAddonManager" = true;
+
+              # WebRTC IP Leak verhindern
+              "media.peerconnection.enabled" = false;
+
+              # Telemetrie vollständig deaktivieren
+              "toolkit.telemetry.enabled" = false;
+              "toolkit.telemetry.unified" = false;
+              "toolkit.telemetry.archive.enabled" = false;
+              "datareporting.healthreport.uploadEnabled" = false;
+              "app.shield.optoutstudies.enabled" = false;
+
+              # SafeBrowsing (lokal behalten, aber keine unnötige Kommunikation)
+              "browser.safebrowsing.downloads.remote.enabled" = false;
+
+              # HTTPS-Only Mode
+              "dom.security.https_only_mode" = true;
+
+              # DNS over HTTPS Fallback deaktivieren
+              "network.trr.mode" = 3;
+              "network.trr.uri" = "https://dns.quad9.net/dns-query";
+
+              # Referrer reduzieren
+              "network.http.referer.XOriginPolicy" = 2;
+
+              # Clipboard API nur bei User Interaction
+              "dom.events.asyncClipboard.readText" = false;
+
+              # WebGL einschränken
+              "webgl.disabled" = true;
+            };
+            SearchEngines = {
+              Default = "Ecosia";
+
+              Add = [
+                {
+                  Name = "Ecosia";
+                  URLTemplate = "https://www.ecosia.org/search?q={searchTerms}";
+                  Method = "GET";
+                }
+              ];
+
+              Remove = [ "Google" "Bing" "Amazon.com" "eBay" ];
+            };
+
         };
     };
     }