fixup! Firefox preference overrides.

browser/app/profile/001-base-profile.js

@@ -48,6 +48,9 @@ pref("security.nocertdb", true);
 pref("browser.download.useDownloadDir", false);
 pref("browser.download.manager.addToRecentDocs", false);
 
+// Prevent download stuffing / DOS (tor-browser#41764)
+pref("browser.download.enable_spam_prevention", true);
+
 // Misc privacy: Disk
 pref("signon.rememberSignons", false);
 pref("browser.formfill.enable", false);