Flush Site Data

Flush Site Data

Adds button/hotkey to clear cookies, localStorage, indexedDB, cache, serviceWorkers, sessionStorage and pluginData for all sites and tabs

What is Flush Site Data?

Flush Site Data is a handy Firefox add-on that adds a button and hotkey to clear various tracking data stored by websites, such as cookies, localStorage, indexedDB, cache, serviceWorkers, sessionStorage, and pluginData. It provides a quick and efficient way to log out of all sites and tabs without any prompts or limitations.

Stats date:
Users: 97 ▲ 2
Rating: 4.75 (4)
Version: 4 (Last updated: 2022-12-13)
Creation date: 2020-01-03
Weekly download count: 3
Firefox on Android: Yes
Manifest version: 2
  • notifications
  • browsingData
  • tabs
  • <all_urls>
Size: 10.74K
URLs: Website
Risk impact: High risk impact
Risk likelihood: Low risk likelihood

Other platforms

Not available on Chrome
Not available on Edge

Adds button/hotkey (default - Alt+C) to flush all cache, cookies, localStorage, sessionStorage, indexedDB, serviceWorkers and pluginData - i.e. all tracking stuff that sites store in browser.

Alternative to Ctrl + Shift + Delete firefox hotkey, but without prompting/checkboxes, and also clearing sessionStorage in all tabs.

It does not clear downloads/history, passwords and form autocomplete data that is (almost entirely) used in the browser UI, not by websites.

Does not ask any questions or limits its scope in any way. Useful to log out of everything, like closing/reopening private browser window. Issues notification on success, and does console.error() on any failure.


User reviews
by Hollytryx, 2022-12-25
View all user reviews
Risk impact

Flush Site Data is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Flush Site Data if you trust the publisher.

Risk likelihood

Flush Site Data has earned a fairly good reputation and likely can be trusted.

Upgrade to see risk analysis details