diff --git a/home-manager/firefox/config/browser-features.nix b/home-manager/firefox/config/browser-features.nix
index cc38229..47d2352 100644
--- a/home-manager/firefox/config/browser-features.nix
+++ b/home-manager/firefox/config/browser-features.nix
@@ -79,7 +79,8 @@
   # Disable preloading of the new tab page.
   # By default Firefox preloads the new tab page (with website thumbnails) in the
   # background before it is even opened.
-  "browser.newtab.preload" = false;
+  # Enabled atm to test performance difference.
+  "browser.newtab.preload" = true;
   # Disable about:addons' Get Add-ons panel
   # The start page with recommended addons uses google analytics.
   "extensions.getAddons.showPane" = false;
diff --git a/home-manager/firefox/config/tracking.nix b/home-manager/firefox/config/tracking.nix
index 9271896..dc48751 100644
--- a/home-manager/firefox/config/tracking.nix
+++ b/home-manager/firefox/config/tracking.nix
@@ -46,7 +46,8 @@
   # Prevent websites from accessing information about webcam and microphone
   # (https://developer.mozilla.org/docs/Web/API/MediaDevices/enumerateDevices)
   # (possible fingerprinting).
-  "media.navigator.enabled" = false;
+  # Enabled to make screensharing work.
+  "media.navigator.enabled" = true;
   # Disable form autofill
   # Automatically filled form fields are used for fingerprinting
   # (https://freedom-to-tinker.com/2017/12/27/no-boundaries-for-user-identities-web-trackers-exploit-browser-login-managers/).