Tracking cookies, also called "3rd party" cookies, are snoopware that watches you as you move across the net, and builds profiles of your behavior and sends it back to a ad agency, which is then sold by these advertising ghouls to anyone who wants direct ads at you.
The Tracking cookie doesn't steal your passwords, it gives you access to the session. After accessing to the session, you will be logged into the account and can change the password, but it doesn't capture passwords or steal them.
Remove Tracking Cookies.
IE – Internet Options > General > Browsing History
Firefox – Options > History >
Chrome – Tools > Privacy > Cookies
Opera – Settings > Preferences > Advanced > Cookies
A best system optimization software not only can easily clean the tracking cookies, but also help scan and protect computer from malware and guard your privacy and speed up computer.