diff --git a/lib/utils.pm b/lib/utils.pm
index 048d3d07..0737a0cd 100644
--- a/lib/utils.pm
+++ b/lib/utils.pm
@@ -423,6 +423,10 @@ sub disable_firefox_studies {
     # it's not at all clear from the code which of these actually gets
     # used, so we set them all just in case
     assert_script_run 'printf "pref(\'browser.urlbar.quicksuggest.shouldShowOnboardingDialog\', false);\npref(\'quickSuggestShouldShowOnboardingDialog\', false);\npref(\'browser.urlbar.quickSuggestShouldShowOnboardingDialog\', false);" > $(rpm --eval %_libdir)/firefox/browser/defaults/preferences/openqa-overrides.js';
+    # and disable the "Automated Cookie Protection" thing that showed
+    # up in Firefox 100 (thanks Ed Lee):
+    # https://bugzilla.mozilla.org/show_bug.cgi?id=1703903#c9
+    assert_script_run 'echo "pref(\'privacy.restrict3rdpartystorage.rollout.enabledByDefault\', false);" >> $(rpm --eval %_libdir)/firefox/browser/defaults/preferences/openqa-overrides.js';
 }
 
 sub repos_mirrorlist {