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diff -up firefox-68.0/widget/gtk/nsWindow.cpp.1196777 firefox-68.0/widget/gtk/nsWindow.cpp
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--- firefox-68.0/widget/gtk/nsWindow.cpp.1196777	2019-05-21 11:29:55.833376744 +0200
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+++ firefox-68.0/widget/gtk/nsWindow.cpp	2019-05-21 12:15:35.446089316 +0200
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@@ -156,7 +156,8 @@ const gint kEvents =
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 #if GTK_CHECK_VERSION(3, 4, 0)
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     GDK_SMOOTH_SCROLL_MASK | GDK_TOUCH_MASK |
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 #endif
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-    GDK_SCROLL_MASK | GDK_POINTER_MOTION_MASK | GDK_PROPERTY_CHANGE_MASK;
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+    GDK_SCROLL_MASK | GDK_POINTER_MOTION_MASK | GDK_PROPERTY_CHANGE_MASK |
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+    GDK_FOCUS_CHANGE_MASK;
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 #if !GTK_CHECK_VERSION(3, 22, 0)
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 typedef enum {