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-rw-r--r--modules/libpref/init/all.js1
1 files changed, 1 insertions, 0 deletions
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index d51172f42..0a92c6d17 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1145,6 +1145,7 @@ pref("dom.disable_window_open_feature.menubar", false);
pref("dom.disable_window_open_feature.resizable", true);
pref("dom.disable_window_open_feature.minimizable", false);
pref("dom.disable_window_open_feature.status", true);
+pref("dom.disable_window_showModalDialog", true);
pref("dom.allow_scripts_to_close_windows", false);