Auto-Clear Site Data Firefox

Auto-Clear Site Data

Finally!!! successor to `Cookie AutoDelete` extension |🧹 Automatically clears site data (cookies, local storage, IndexedDB, Cache, SW) when you close a site's last tab, with full support for Firefox Containers 📦 and Firefox for Android 📱.

Features & Capabilities

Auto-Clear Site Data automatically wipes cookies, localStorage, IndexedDB, cache, and service workers when you leave a site — whether you close the last tab, navigate away, or the browser discards it. Stay private and keep your storage clean without lifting a finger. 🧹

Key features include configurable delays, startup cleanup, and independent exemption rules (Whitelist/Blacklist) plus per-container rules for Firefox Containers and granular data-type controls. It’s fully local, privacy-first, and designed for performance with smart dependency tracking and deferred clearing.

User Growth & Download Statistics

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.
Developed by:
byuserforuser
Firefox Add-ons Store
https://addons.mozilla.org/firefox/addon/auto-clear-site-data/

Permission Change History

2025-11-29: Version 3.6.1 → 3.7.1
Add Optional permissions: notifications
2025-11-16: Version 1.44.4 → 2.0.0
Add Host permissions: <all_urls>
Add Permissions: alarms
Remove Permissions: <all_urls>
2025-11-04: Version 1.18 → 1.42.0
Add Permissions: webRequest

User Reviews

A good replacement for a now-defunct extension, as many have pointed out; more specifically it seems to have much more robust options, aside from the lack of greylist vs whitelist. However, it seems to have an issue with Google sites in particular where it keeps randomly signing me out. I have added a number of other google subdomains to the whitelist, yet nothing seems to help. Other sites I use work fine however.
by Ri*****, 2026-06-01

Edit: Meanwhile I've identified a problem. My goal is to preserve data from open tabs across browser sessions. To accomplish this, I need to disable the "Clear Sites from last session on startup" setting. However, this can lead to a situation where data from closed tabs is sometimes never deleted—especially with significant clearing delays and forced browser termination, both of which occur in my usage. Therefore, it would be helpful to add a sub-option to "Clear Sites from last session on startup," such as "...but never clear sites in open tabs." My first review: Many thanks for this nice work. "Auto-Clear Site Data" is a worthy successor to CAD. Works perfectly for me. To everyone complaining about missing source code: That's incorrect. Firefox add-ons are always open source by design—to read the complete code, simply download the add-on and unzip it. Anyway, I must emphatically reject the author's flawed reasoning: The notion that concealing source code improves security is not only wrong—it demonstrates a fundamental misunderstanding of how security actually works. Obscuring code does not protect users; it only prevents security researchers and the community from discovering and fixing vulnerabilities. This is basic industry knowledge. Any developer with genuine expertise knows that open-source scrutiny increases security, while secrecy creates blind spots. The author's position, however well-intentioned, is both technically indefensible and counterproductive.
by ne*****, 2026-05-31

and you still haven't open source this?
by mi*****, 2026-03-30
View all user reviews ›

Is Auto-Clear Site Data Safe?

Risk impact
Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Auto-Clear Site Data requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details
  • Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
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  • High ****** *** ********* ** ******* *** ******* ******* ** ****** *** *** ******** ******
  • High ****** ********* ** * ****** ******** ******** ********** * ******* ******* *****
Risk likelihood
Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Auto-Clear Site Data is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details
  • High This extension was recently updated in the past month. New updates may not be stable or safe.
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  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Good **** ********* *** **** **** *******
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