--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -233,17 +233,17 @@ pref("dom.keyboardevent.dispatch_during_
 pref("dom.keyboardevent.keypress.dispatch_non_printable_keys_only_system_group_in_content", true);
 // Blacklist of domains of web apps which are not aware of strict keypress
 // dispatching behavior.  This is comma separated list.  If you need to match
 // all sub-domains, you can specify it as "*.example.com".  Additionally, you
 // can limit the path.  E.g., "example.com/foo" means "example.com/foo*".  So,
 // if you need to limit under a directory, the path should end with "/" like
 // "example.com/foo/".  Note that this cannot limit port number for now.
 pref("dom.keyboardevent.keypress.hack.dispatch_non_printable_keys",
-     "docs.google.com,mail.google.com");
+     "docs.google.com,mail.google.com,hangouts.google.com");
 #else
 pref("dom.keyboardevent.keypress.dispatch_non_printable_keys_only_system_group_in_content", false);
 #endif
 
 // Whether the WebMIDI API is enabled
 pref("dom.webmidi.enabled", false);
 
 // Whether to enable the JavaScript start-up cache. This causes one of the first