This depends on which operating system you are using. Follow the instructions below, and look for a file name that begins with "cookies." This is where your browser's cookies are stored.
XP stores cookies in the "%USERPROFILE%\Application Data\" directory.
Vista and 7 store cookies in the "%userprofile%\AppData\Roaming\Microsoft\Windows\Cookies" directory.
To find this directory in any of these operating systems, select "Run..." from the Start menu, or hold down the Windows key (between Ctrl and Alt) and press "R." A command line will pop up. Type "%APPDATA%" and click "OK." This hidden folder will open in Window Explorer.
If you want to find cookies used by Firefox, open the "Mozilla" folder, and then the one labeled "Firefox." Your cookie file is stored in this folder.
If you want to find Internet Explorer cookies, navigate to "\Microsoft\Windows\Cookies\."
Google Chrome stores cookies in the directory "\Google\Chrome\User Data."
User information is stored in files inside your home folder using subfolders beginning with a period. These are hidden from users, so you may need to enable "Show Hidden Files" in your file browser to find them.
Most Linux browsers are based on Mozilla, including Firefox, Seamonkey, Galeon, Konqueror, and Epiphany. The cookies for these browsers can be found in ".mozilla."
Chrome stores cookies in ".gconfd."
OSX stores cookie files somewhere in the "Library" folder.
Firefox uses "/Library/Mozilla/" or "/Library/Application Support/," Safari uses "/Library/Cookies," and other browsers will use their own name, such as "/Library/Opera."
Posted 1883 day ago