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Re:Comcast injecting JS by BoyWizard on Tuesday April 02, 2013 @05:49PM (#5482362)
They have a comment in the script

  // Intended use is to display browser notifications for critical and time sensitive alerts.
I imagine you can rack up a fair amount of usage before checking emails, only to find you went over your cap a few hours ago.
Re:Comcast injecting JS by nitrogen on Tuesday April 02, 2013 @07:52PM (#5483048)
All the more reason not to have hard caps on bandwidth.