当サイトはユーザー体験を改善するためのメンテナンスを実施中に機能が制限される予定です。記事を読んでもあなたの問題が解決せず質問をしたい場合は、Twitter の @FirefoxSupport、Reddit の /r/firefox で、サポートコミュニティが皆さんを助けようと待機しています。

Mozilla サポートの検索

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

詳しく学ぶ

このスレッドはアーカイブに保管されました。 必要であれば新たに質問してください。

Why Cookies and Site Data are not completely deleting every time I close Firefox?

  • 5 件の返信
  • 1 人がこの問題に困っています
  • 21 回表示
  • 最後の返信者: MinimalTech

more options

Hi. I am using Firefox for years, mainly due to it's increased security and privacy settings it provides. As you can see in the attached screenshots, I have set Firefox in Privacy & Security tab to Strict Tracking Protection and to Never remember history. The problem is that, when I close and reopen Firefox, NOT all cached content gets deleted automatically!

Please see my screenshot of Cookies and Site Data section. You will see that there is 1.1MB of Cached Web Content which is not deleted. If I don't manually delete this content (e.g. every week), the size of it gets grow to a very big number of MB (400-500MB).

Why Firefox is not deleting the Cached Web Content automatically since I told it explicitly to do it by choosing Never remember history?

I am using Mozilla Firefox 76.0.1 (64-bit) on Windows. This happens in all of my PCs..

Is this a Bug?

Hi. I am using Firefox for years, mainly due to it's increased security and privacy settings it provides. As you can see in the attached screenshots, I have set Firefox in Privacy & Security tab to '''Strict''' Tracking Protection and to '''Never remember history'''. The problem is that, when I close and reopen Firefox, '''NOT all cached content gets deleted automatically!''' Please see my screenshot of Cookies and Site Data section. You will see that there is 1.1MB of Cached Web Content which is not deleted. If I don't manually delete this content (e.g. every week), the size of it gets grow to a very big number of MB (400-500MB). Why Firefox is not deleting the Cached Web Content automatically since I told it explicitly to do it by choosing Never remember history? I am using Mozilla Firefox 76.0.1 (64-bit) on Windows. This happens in all of my PCs.. Is this a Bug?
添付されたスクリーンショット

この投稿は MinimalTech により に変更されました

すべての返信 (5)

more options

Location of the cache/cache2 folder; Windows: *C:\Users\<user>\AppData\Local\Mozilla\Firefox\Profiles\<profile>\ Mac: ~/Library/Caches/Firefox/Profiles/ Linux: ~/.cache/mozilla/firefox/

Close Firefox. Open your file browser to the above, and remove the folder.

more options

Hi FredMcD, there are 2 folders inside \Profiles\:

1) (random-code).default-release

2) (random-code).default

The folder No.1 has 7 sub-folders inside and the folder No.2 is empty in the PC I am using right now (Windows 10 Pro). Which folder should I delete?

Also, if I delete my profile folder, am I going to loose my Bookmarks and the Settings I have made in Firefox? Is it safe to delete these folders?

この投稿は MinimalTech により に変更されました

more options

Hello MinimalTech,

If you reopen tabs automatically the next time then Firefox stores cookies from those tabs by default as part of the session data in the sessionstore.js file.

http://kb.mozillazine.org/Session_Restore

You can set the browser.sessionstore.privacy_level pref to 2 (never) or 1 (non-HTTPS) on the about:config page to disable saving cookies via session restore.

The browser.sessionstore.privacy_level_deferred pref is used when you do not reopen the previous session automatically via "Show my windows and tabs from last time" and uses the same values.

http://kb.mozillazine.org/browser.sessionstore.privacy_level

Hope it works !
more options

If you use Firefox in Private Browsing mode then all session data is stored in memory and purged automatically when you close Firefox, so there is no need to clear data stored in the profile.
If you still have data stored on the hard drive like in the disk cache then you can't remove this data when you are in PB mode (it is there waiting for you if you start Firefox in regular mode).
You would either have to start Firefox in regular mode or clear this data yourself on the hard drive if that bothers you.

more options

@Shashank Shekhar,

no, I do not reopen tabs automatically in Firefox. When I finish browsing, I close Firefox from the classic "X" button of it's window and when I open it again, I have only 1 tab with my Homepage I have set loaded.


@cor-el,

I am using Firefox with "Never remember history" mode (please watch the attached screenshots). By this, I think I have told Firefox to NOT remember anything. But Firefox "remembers" or to be more specific "forgets" to delete anything from a browsing session on this mode. Specifically forgets to clear the Cached Web Content.

I can clean it of course manually in Private Browsing mode (it is not true that I can't and need to be in regular mode) but that is not the point!!

Firefox must "forget" everything from a session because if it don't do it, then it leaves privacy data exposed...

So, is this a Bug? Or deliberately Firefox forgets to delete the Cached Web Content?