Install a cookie manager on Firefox - Cookie AutoDelete

Browser cookies can be useful but are often abused to track your online activity across the web. In this guide you'll learn how to install Cookie AutoDelete, a web-browser add-on that automatically deletes unused cookies.

Last modified
11th March 2021
Guide level
Guide Browser

Browser cookies allow websites to preserve session data such as your login credentials or items in your shopping basket so that you don't lose information when you close the page. Unfortunately, they are often abused to track your online activity across the web. Using a dedicated addon, you can clean your cookies regularily to ensure that no unwanted cookie is kept in your browser, limiting the efficienty of online trackers.

This guide explains how to install Cookie AutoDelete, a web-browser add-on that automatically deletes unused cookies.

Warning: Cookies are widely used on the web and this extension might break some website features. Be sure to understand what it does and how to disable it before installing it!


Like any other add-on, install Cookie AutoDelete by visiting the Mozilla Firefox Add-ons page and clicking Add to Firefox (Fig. 1) and then clicking on Add when prompted (Fig. 2).

Fig. 1: Download Cookie AutoDelete
Fig. 2: Add Cookie AutoDelete to Firefox
Fig. 3: Notification of successful installation

Upon successful installation a notification appears on the top-right corner, and the Cookie AutoDelete icon is added to your toolbar (Fig. 3). When you visit a website, the Cookie AutoDelete icon shows the number of stored cookies for that website. By clicking the icon (Fig. 4), you are able to clean cookies, and also whitelist (permanently) or greylist (until a browser restart) websites you trust to store cookies.

Fig. 4: Cookie AutoDelete pop-up interface

The extension disables automatic cleanup by default. To enable it, click the icon (Fig. 4) and then click on Auto-clean disabled. That way, you don't have to remember to manually clean your cookies: when you close a browser tab, any cookies no longer in use are automatically deleted. This is a double edged swords: this means that all tracking cookies will be deleted but also means you will be logged out of any session you currently had open. Enabling this option is equivalent to "starting anew" every time you open your browser (although you can keep your tabs open, you won't be logged in anywhere apart from the website you whitelisted).

Avoid tracking from whitelisted cookies

If you want to disable Cookie AutoDelete for some website (e.g. your email client), you can whitelist it by clicking the add-on icon and then clicking on Whitelist (Fig. 4). However, note that whitelisted cookies may still communicate between themselves and temporary cookies, thus tracking your activity. The two options below help you avoid this behaviour.

Adding a site to the whitelist is particularily useful if you want to stay connected on a particular site (like your email account) even after your restart your browser.

Use Firefox Multi-Containers

To ensure cookies from whitelisted domains remain isolated, you can create one container for each whitelisted domain. To learn more about Firefox Multi-Account Containers read our guide on how to set it up. For this to work, it's important to keep the setting Enable Support for Firefox's Container Tabs disabled (Fig. 5).

Fig. 5: Disable support for Firefox Containers

Enable First Party Isolation

You can also enable First Party Isolation so that cookies from different domains are isolated. This is the most effective way to ensure temporary cookies do not cross-reference your activity before they are deleted. Note, however, that this may introduce some performance penalty. To learn how to enable First Party Isolation in Firefox, read our guide on Firefox privacy settings.

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