It can't be in your computer or NoScript wouldn't be detecting it (see below), you open a page and NoScript by default should block all scripts unless you specifically allow them. Now you have NoScript set up to constantly ask you if it is OK to run x script (Options, Notifications, Show message about blocked scripts), this would drive me bonkers and I have it disabled.
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Unless there is malware on your system that is opening a web page in your browser (and that doesn't seem to be the case), then NoScript shouldn't have cause to notify you.