fix(firefox): resolve syntax error in web-app profile

apps/firefox/profiles/web-app.nix

@@ -58,12 +58,8 @@
     "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
-    
-    # --- Tridactyl (attempt to override) ---
-    # We can't easily set per-profile tridactylrc, but we can try to minimize its newtab impact
-  };
 
-  userChrome = ''
+    # --- DNS over HTTPS (Quad9) ---
     "network.trr.mode" = 2; # Use DoH with system fallback
     "network.trr.uri" = "https://dns.quad9.net/dns-query";
   };
@@ -126,4 +122,4 @@
       background: transparent !important;
     }
   '';
-}
+}