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-rw-r--r--modules/libpref/init/all.js3
1 files changed, 3 insertions, 0 deletions
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index d135f9309..beab06aff 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -155,6 +155,9 @@ pref("dom.select_events.textcontrols.enabled", true);
pref("dom.select_events.textcontrols.enabled", false);
#endif
+// Whether or not the document visbility API is enabled
+pref("dom.visibilityAPI.enabled", true);
+
// Whether or not Web Workers are enabled.
pref("dom.workers.enabled", true);