[Wolves] Security problem in firefox, what was it?

[Kevanf1]

Could somebody refresh my memory, please?  There was a post the other
day detailing a security problem that hit Firefox but, rather
perversely, did not hit Internet Explorer as long as it hadn't been
updated.  But I must have deleted the post and I have been asked about
it.  DOH!!!!
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Take care.
Kevan Farmer

34 Hill Street
Cheslyn Hay
Staffordshire
WS6 7HR