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As far as the Alexa plug-in..... I don't ever use it.
Tipton, my friend… Alexa plug-in is using itself, of course against you. It’s one of worst spyware/adware things ever…
Run Spybot - Search and Destroy, and LavaSoft’s Ad-Aware. You’ll see results… those two will report you every single Alexa key inside your registry…