Deleting Cookies Stored in Firefox

This section provides a tutorial example on how to delete all cookies currently stored in Firefox and change settings to ask Firefox to delete new cookies when the browser is closed.

Cookies persisted on your computer hard disk always pose potential security risks. You should review and delete persisted cookies in Firefox regularly.

1. Run Firefox and click "Tools > Options" menu. Then click the "Privacy" tab.

2. Select "Firefox will: Use custom settings for history" option. You will see more settings showing up.

3. Click the "Show Cookies" button. You will see the "Cookies" dialog box.

4. Open any site in the site list and select any cookie entry. You will see details of the cookie displayed.

For example, I selected "lidc" cookie from "". The value of the cookie is a list of parameter. LinkedIn could be using this cookie to remember something I did when I visit their last time and to provide better user experience when I visit it again. If I delete this cookie, I can still visit LinkedIn.

5. Review all cookies from each site. You may see cookies from a site that you have never visited before.

For example, I saw a site named as: "" in the site list. It has one cookie: NSC_betivggmf-opef. Clearly, some other site I visited hosted an add from, which pushed a persisted cookie to my computer.

6. Click the "Remove All Cookie" button. Firefox will delete all persisted cookies.

The picture below shows the "Remove All Cookies" button in Firefox:
Firefox Deleting Persisted Cookies

Last update: 2013.

Table of Contents

 About This Windows Security Book

 Windows 8: System Security Review

 Windows 8: System Security Protection

 Windows 8 System Recovery

 Windows 8 Defender for Real-Time Protection

 Windows 7: System Security Review

 Windows 7: System Security Protection

 Windows 7 System Recovery

 Windows 7 Forefront Client Security

 Norton Power Eraser - Anti-Virus Scan Tool

 McAfee Virus and Malware Protection Tools

 Spybot - Spyware Blocker, Detection and Removal

Keeping Firefox Secure

 Keeping Firefox Up To Date

 Start and Download Options for Firefox

 Content Type Handler Applications

 Privacy Options: Tracking, History and Cookies

 Security Options: Add-Ons and Passwords

Deleting Cookies Stored in Firefox

 Getting New Add-Ons in Firefox

 Disabling Extension Add-Ons in Firefox

 Disabling Plugin Add-Ons in Firefox

 Disabling Search Engines in Firefox

 Reviewing Advanced Settings in Firefox

 Keeping IE (Internet Explorer) Secure

 Malware (Adware, Spyware, Trojan, Worm, and Virus)

 HijackThis - Browser Hijacker Diagnosis Tool

 IE Add-on Program Listing and Removal

 "Conduit Search" - Malware Detection and Removal

 "Tube Dimmer", "Scorpion Saver" or "Adpeak" Malware

 Malware Manual Removal Experience

 Vundo (VirtuMonde/VirtuMundo) - vtsts.dll Removal

 Trojan and Malware "Puper" Description and Removal

 VSToolbar (VSAdd-in.dll) - Description and Removal

 PWS (Password Stealer) Trojan Infection Removal

 MS08-001 Vulnerability on Windows Systems

 Antivirus System PRO


 PDF Printing Version