I need to delete one cookie left behind by a webpage without just deleting all my other cookies. Any way to find out what cookie is left behind by a particular webpage?
Are you being a naughty moose? As posted above is correct. You can also search for files on your PC modified in the last x days, should make any other incidentals show up too including cached pages, images, etc.
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What OS are you running? Have you tried running a system search on that particular website URL?