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One of my organization's web servers (Ubuntu with Apache & PHP) recently got knocked out of service by a sudden burst of 400ish repeated requests in 20 seconds from a logged-in user. It looks accidental, rather than a deliberate attack.

Here are two representative lines from the log (slightly munged for privacy): - - [17/Oct/2012:15:06:20 -0400] "GET /blahblah/view.php?id=12345 HTTP/1.1" 200 2238 "" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0" - - [17/Oct/2012:15:06:20 -0400] "GET /blahblah/view.php?id=12345 HTTP/1.1" 200 4331 "" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0"

Obviously we are fixing the server config so dumb stuff like that doesn't kill it. But I'm curious: what might cause Firefox to do that?

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Just holding down F5 will do this.

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