Flush Site Data - Firefox Add-on
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Add-on summary
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
Add-on safety
Risk impact
Flush Site Data requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.
Risk likelihood
Flush Site Data has earned a fairly good reputation and likely can be trusted.