Download and install Mozilla Firefox.
Click on the Menu Button (the three stacked horizontal lines at top right corner) and select Add-ons and Themes, in the search field type "Cookie" and hit enter, the results gone come up yea. Select the Cookie Quick Manager by Ysard and install it (or use the link provided at the end of the tutorial), you can choose to make it run in incognito or not -- your call.
You should see the cookie icon pinned to the add bar now. Click on it and a pop-up appears, select "Manage all cookies", a new tab opens up, click on "Export/Import" at the bottom left corner (its the third icon) and select "Restore cookies from file", select your cookie .txt file and you've successfully imported cookies.
For example you got a botnet spammed 53rd bank log, importing the cookies gone grant you direct access to the email provider such as gmail just by visiting mail.google.com and many other site the vics got accts with.
SIDE NOTES :
- The cookie manager can also clear cookie sessions effectively as well. This is recommended a lot in carding ops. Click on the cookie manager icon at the addy bar and a pop-up appears, select "Manage all cookies", a new tab opens up, select the Trash Bin icon at bottom left corner and select continue on the pop-up that appears to clear all cookie sessions.
- Imported cookies don't last forever, they expire after a certain period of time -- usually a couple of days or a week max.