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Re:"Diff for HN": Update and highlight changes by brown9-2 on Monday April 11, 2011 @12:46PM (#2433205)
Updates every couple of minutes - but if you move to another tab (and leave HN open) no updates will happen until you get back.

Just curious: is this out of some Chrome extension limitation or to cut down on unnecessary refreshes?

Re:"Diff for HN": Update and highlight changes by obeattie on Monday April 11, 2011 @12:52PM (#2433209)
This is part of the original script, out of my control.

All the extension actually does is load the original script when you visit HN.