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

By:
byuserforuser
Daily users:
128 11
Rating:
3.81
(16)
0.08
Version:
3.19.0 Last updated: 2026-07-30
Version code:
6383870
Creation date:
2025-10-26
Firefox add-on GUID:
auto-clear-site-data@byuserforuser.com
Firefox add-on numeric ID:
2952551
Weekly download count:
16
Firefox on Android:
Yes
Risk:
High risk impact Moderate risk likelihood
Permissions:
Host permissions:
  • <all_urls>
Size:
187.56KB
URLs:
Privacy policy
Full description:
See detailed description
Source:
Firefox Add-ons Store
Data ingested on:
2026-09-13
Compare stats and ranking:

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

Question about the "Clear Sites from Last Session on Startup" option: when it processes "Pending Clears" from the previous session, does it call browsingData.remove() immediately on startup, or does it attempt to resume the original delay/navigation-step countdown for each pending entry? Related: is there any internal delay before the startup pass actually runs (e.g. waiting on session restore or on the tabs API becoming ready)? On Android, the OS can kill Firefox's process again very shortly after relaunch under memory pressure, so if the startup flush itself has a delay window before it executes, the same process-kill race that created the pending entry in the first place could in theory recur during the startup pass. Just want to confirm whether the startup flush is effectively immediate/atomic, or has its own window of vulnerability.
by Fi*****, 2026-09-11

Love the addon! Bugs/Improvements: 1)This setting is not saved: Preserve data for recent sites in the same tab (useful for "Back" button) -- (I changed it to 1, but it defaults back to 4) 2) Option to clear cookies / objects immediately after visiting a website (blocking cookies breaks the website, but accepting them and removing them right away works fine). 3) Ability to remove the red number icon (it's distracting when the icon is pinned). 4) Add Cookie Browser dialog that shows domains for which cookies are currently stored and add ability to set/adjust cookie rules from that dialog. Can get inspiration from Firefox addon Forget me not (click on black book icon with dot on top)
by Fi*****, 2026-07-29
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.
  • Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
  • 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 has low user count. Unpopular extensions may not be stable or safe.
  • Medium **** ********* *** ******* ** *** **** * ******* *** ******* *** *** ** ****** ** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Good **** ********* *** **** **** *******
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