If your reason for doing this is to prevent someone from seeing your purchases, it may be simpler to change your ID (you will not lose your feedback), then change your password.
Don't tell anyone your new ID or new password.
Always log out when you leave the site.
No one who does not have your ID and password can see those lists.
Remove the eBay bookmark from your dropdown list-- it takes only seconds to google eBay.ca and enter the site from there.
You can also ask your sellers not to leave you feedback and never leave feedback yourself.
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