[Mozilla Enterprise] DOM events changes coming to ESR 68

[Mike Taylor]

Hi all,

We introduced some changes to DOM events (adding window.event, 
event.returnValue, and changing how event.keyCode inside a keypress 
handler works) to be more interoperable with existing web content and 
other browsers. These changes landed in 66, but make their first ESR 
appearance in 68.

In case you have legacy content that breaks in unexpected ways, we've 
prepared an article[1] that describes how to opt into the legacy 
behavior via prefs. These preferences can be set via the new Preferences 
enterprise policy.

[1] 
<https://support.mozilla.org/en-US/kb/dom-events-changes-introduced-firefox-66>

thanks,

-- 
Mike Taylor
Web Compat, Mozilla