diff --git a/modules/libpref/src/init/all.js b/modules/libpref/src/init/all.js
index 71c80cc53726..6878649a4461 100644
--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -501,7 +501,7 @@ pref("advanced.mailftp",                    false);
 pref("image.animation_mode",                "normal");
 
 // Same-origin policy for file URIs, "false" is traditional
-pref("security.fileuri.strict_origin_policy", true);
+pref("security.fileuri.strict_origin_policy", false);
 
 // If there is ever a security firedrill that requires
 // us to block certian ports global, this is the pref