• Click the menu button, the menu button will be in the top right-hand corner of Firefox, it looks like three horizontal lines on top of each other >> Then Click the "Settings" menu item.

  • Click the "Privacy & Security" menu item

  • Scroll down and select the "Custom" menu item >> To allow cookies, make sure that the Check-Box for "Cookies" is unchecked.

  • Close the page. Any changes you've made will automatically be saved.

For the Previous Version Of Firefox:

  • Click the Menu button and choose Options.
  • Select the Privacy panel.

  • Set "Firefox will" to  "Use custom settings for history".

  • Check the "Accept cookies from sites" checkbox to enable cookies, and uncheck it to disable them.
  • If you are troubleshooting problems with cookies, make sure "Accept third-party cookies" is also not set to "Never". For more information, see Disable third-party cookies in Firefox to stop some types of tracking by advertisers.
  • Choose how long cookies are allowed to be stored:
  • Keep until: they expire: Each cookie will be removed when it reaches its expiration date, which is set by the site that sent the cookie.
  • Keep until: I close Firefox: The cookies that are stored on your computer will be removed when Firefox is closed.
  • Keep until: ask me every time: Displays an alert every time a website tries to send a cookie, and asks you whether or not you want to store it.

Click "OK" to close the "Options" window .

Click the "Privacy & Security" menu item