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-rw-r--r--modules/libpref/init/all.js4
1 files changed, 2 insertions, 2 deletions
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 4fdc2676a..6f31cb8cc 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -5437,11 +5437,11 @@ pref("media.block-autoplay-until-in-foreground", false);
pref("layout.css.servo.enabled", true);
#endif
-// TODO: Bug 1380959: Block toplevel data: URI navigations
+// Block toplevel data: URI navigations
// If true, all toplevel data: URI navigations will be blocked.
// Please note that manually entering a data: URI in the
// URL-Bar will not be blocked when flipping this pref.
-pref("security.data_uri.block_toplevel_data_uri_navigations", false);
+pref("security.data_uri.block_toplevel_data_uri_navigations", true);
// Disable Storage api in release builds.
#ifdef NIGHTLY_BUILD