Firefox — Fora społeczności

Firefox prompted me to update, I hit download, my entire PC froze, I restarted the computer, when I opened firefox again and hit "restore session" it restored a session that I had opened months ago. When I checked my history, everything after that older session had been deleted. All of my history from the past few months has been deleted. I tried a few different solutions from trying to research the problem, nothing so far has worked. The only thing I have found is a session restore error saying "could not decompress file", but I could not find the file it was attempting to decompress. This is the error message I found.

1785894397652 SessionStore ERROR NotReadableError when reading session file: recovery: NotReadableError: Could not read `C:\Users\ansen\AppData\Roaming\Mozilla\Firefox\Profiles\xpnhovd6.default-release\sessionstore-backups\recovery.jsonlz4': could not decompress file: invalid LZ4 header: wrong magic number: `00 00 00 00 00 00 00 00 00 00 00 00' (NS_ERROR_FILE_CORRUPTED) No traceback available 1785894397756 SessionStore ERROR NotReadableError when reading session file: recoveryBackup: NotReadableError: Could not read `C:\Users\ansen\AppData\Roaming\Mozilla\Firefox\Profiles\xpnhovd6.default-release\sessionstore-backups\recovery.baklz4': could not decompress file: invalid LZ4 header: wrong magic number: `00 00 00 00 00 00 00 00 00 00 00 00' (NS_ERROR_FILE_CORRUPTED) No traceback available

Any help is greatly appreciated. I'm one of those people that tends to have way too many tabs open at once due to poor memory, and losing months of tabs and progress is a huge setback. I'm very desperate to get the history and tabs back.

Every time I go into firefox there seems to be another update to download. I conform to ensure I'm up to date. The latest has changed my display to a basic display. All my bookmarks are gone. I cannot access the back up file on my W11 computer. I have a new android phone and I installed firefox on that, but I have yet to use the application as a browser, on that phone. I tried to recover from the phone, but it does not give me the options to select to follow the steps firefox says I should take. It does not allow me to scan the QR code. I desperately need my bookmarks. If I go to the help, obviously others have the same problem. I see the questions but no answers, I am signed in. I have been trying now for 2 hours. Please help. Jill

Why does Firefox do this? Its not the first time this has happened to me, but now I'm lost.

After several windows problems, I did a clean install with forgetting to sync or backup on my profile and lost a good bit of my bookmarks. However, I managed to retrieve some files, but they seem corrupted and after going through forums and several researches, I am unable to use them. I tried to look at the files and some of them turned to chinese and others have strange symbols in them. Thanks lovely people!

I was reinstalling my windows and created a backup from my old firefox into my usb drive. My backup failed and coudn't be restored, I'm confident that I use the correct password, tried to copy the file from usb drive into my laptop and select it from there but the result is the same, if you guys would be so kind as to guide me on how to restore my backup, since my password and everything is in there. I didn't create another backup since I believe that this one would succeed. Thank you in advance.e

After a recent Firefox update, all of my saved passwords disappeared.

I checked my Firefox profiles and found that the current `logins.json` and `logins-backup.json` files were newly created on August 30, 2026 and contain no passwords.

However, in the older profile data I still have:

• `logins.db` — approximately 480 KB, modified August 19, 2026
• `key4.db` — approximately 288 KB, modified August 18, 2026
• `signedInUser.json`
• `storage-sync-v2.sqlite`

I opened a COPY of `logins.db` using DB Browser for SQLite. It contains:

• 392 records in `loginsM`
• 5 records in `loginsL`

The records clearly contain my saved websites in the `origin` field.

The table columns are:

`_rowid_` `id` `origin` `httpRealm` `formActionOrigin` `usernameField` `passwordField` `timesUsed` `timeCreated` `timeLastUsed` `timePasswordChanged` `secFields` `guid`

The `secFields` values begin with:

`eyJhbGciOiJkaXIiLCJlbmMiOiJBMjU2R0NNIn0`

Unfortunately, after discovering that my passwords were missing, I also reset my Mozilla account password. I understand that this may have affected the server-side Sync data.

My main question is:

Since the 392 encrypted login records are still physically present in the local `logins.db`, is there a supported or technically safe way to recover/decrypt those records and restore them to Firefox?

I still have the older `key4.db` and have preserved copies of all of these files without modifying the originals.

I am currently also attempting Windows File Recovery to look for an older deleted `logins.json`, but I would especially appreciate guidance on whether the surviving `logins.db` can be used for recovery.

Bill

I used to have a whole list of "marque-pages", which apparently totally disappeared after a software update which I never requested. This really is INFURIATING  !!!!

個人的にFirefoxの過去のアクセス履歴が欲しいため、毎日places.sqliteのバックアップを取得していました。 先日、バージョン154.0になった時点で、突然それまで利用していたアクセス履歴やブックマークが使えなくなり、バックアップしていたplaces.sqliteファイルをコピーしても同様の現象が起こってしまいます。

詳しく調べたところ、どうもバージョン154からplaces.sqliteに格納されているテーブルの構造が変わっているようで、アクセス履歴などが消えた理由もそこにありそうです。

今後も過去のアクセス履歴は利用したいため、直前のバージョンのplaces.sqliteを新しいバージョンに移行する具体的な方法について、もしご存じの方がいらっしゃったらご教示お願いします。 （sqlite managerなどツールを使ってのインポート／エクスポートは既に試しております）