Diễn đàn hỗ trợ Firefox

helloooo

i am experiencing an issue with firefox where backup (Firefox Backup) is not working since version 148.0

problem: - when I try to create a backup, i get the error: “Hmm, there was a problem with the backup. Please try again in a few minutes.”

what I have already tried: - enabled and disabled backup password - changed the backup folder/location - cleared browser cache - tested across multiple updates (issue persists)

- backup is enabled, but I cannot create one - the error occurs every time - restarting the browser and system did not help

I asked a question about how to sync my new laptop with the one on this old laptop (Windows 10) The problem I had is that the codes Mozilla sent to my email. That email is so slow that by the time I receive it, it already expired. This is the answer I got from a robot: One thing you could try is logging in to your email via a browser instead of the email app which could speed up the time it takes for you to get the email. Another solution is to manually copy the profile on your old computer putting it on a usb stick and the opening it on your new computer.

1. I always log onto my email via Firefox browser, and it still does not arrive before the code expires. 2. I went into my profile a clicked on "Copy Profile." Firefox copied my profile and asked me to rename it. I did that. Now there are two copies of my profile -- the original and the renamed one -- but my question now is: How do I copy it onto an USB drive? or how to "manually" copy my profile?

Background: On August 6th morning EST after the August 5 2026 update, attempting to use firefox lead to the window with the "end process" button so I had to close the browser multiple times and then the next time I opened firefox, the bookmarks and history were wiped. I was able to restore using a backup saved on the computer and continue as normal (aside from losing some Cookie Clicker progress, reinstalling Tampermonkey userscripts, and redoing browser extension settings) but now there's an issue with trying to backup firefox data.

Issue: Trying to back up my firefox data leads to a "There was a problem backing up. Try again in a few minutes."

When going to about:config and typing browser.backup.backup-debug-info, I get {"lastBackupAttempt":1786243812,"errorCode":9,"lastRunStep":13}

When looking at Broswer Console, there is an entry saying BackupService: Could not create C:\Users\USERNAME\Documents\Restore Firefox\desktop.ini: NotAllowedError: Could not write to `C:\Users\USERNAME\Documents\Restore Firefox\desktop.ini': failed to open file for writing (NS_ERROR_FILE_ACCESS_DENIED) BackupService.sys.mjs:4116:23 but I don't know how to address that.

Hello, when automatic offline backup in stable firefox was first introduced, it worked perfectly fine. It created automatic backups in folder I pointed to. Unfortunately few weeks later it stopped working completely, no idea why. I tried following support article, which is limited to turning backup off, deleting folder and turning it on again. Unfortunately it did not help. As soon as backup starts, it gives me error and does not create any file. It shows "creating backup..." for few seconds, then this banner disappears and only error banner remains.

Can you suggest me advanced troubleshooting for this? Maybe there is some log file which could point me in right direction?

I am wondering if it is some issue with Polish language, because I point to D:\Firefox backup\Restore Firefox but it creates "Przywróć Firefoksa" folder.

helloooo

i am experiencing an issue with firefox where backup (Firefox Backup) is not working since version 148.0

problem: - when I try to create a backup, i get the error: “Hmm, there was a problem with the backup. Please try again in a few minutes.”

what I have already tried: - enabled and disabled backup password - changed the backup folder/location - cleared browser cache - tested across multiple updates (issue persists)

- backup is enabled, but I cannot create one - the error occurs every time - restarting the browser and system did not help

For some reason, firefox keeps asking me to backup my info to "get ready for windows 11" [see attached image]. I have back ups disabled, I don't want to have firefox back up my information.

I click the [x] and it just comes back with every new tab.

Stop. [Expletive]. Harassing. Me.

Ok, This is a bit of a question that seems to have many answers but none that have ever worked for me. I have in the past 12 months probably formatted my PC 4 times, and I have at least 12 profiles on Firefox nightly, not to mention the rest of the family. It's not really a problem to redo them every time, but it is just a painstaking simple process. If I could just backup the profile folder, copy it move it change it whatever, it would be nice and simple, even to transfer from one pc to another in the house, but every time I try, It fails. Copy the Userdata folder, copy the entire firefox folder, blah blah blah, never can I do it. I believe it has something to do with security that you can't just copy and the entire profile folder, but some way to backup the profiles exists surely? One that actually works. Cheers All!

Hi, I recently had a situation where I closed my browser, and when I opened it back up all my tabs and entire session was gone. There was no option to restore via any of the common or traditional ways. This was honestly traumatizing because I've put so much work into the setup of my tabs/folders, etc., for work purposes. SO MUCH TO LOSE. I ended up finding a partial restore deep in the files on my computer, but it missed the past 6 weeks, which I could never recover.

I'm sure I'm not alone - I've seen many, many posts and people talking about this. I think it's extremely important for Mozilla to ensure that the option of restoring browser sessions remains a reliable one, as many people have important work info, etc.

MY QUESTION: Is there a way to manually set a restore point? In other words, I was able to find the files from the browser session, saved up until 6 weeks ago, but no later than that. So, it's clearly saving sessions somewhere... I'd think it would be easy to prompt it to save at that current point in time asking it to save. Anyone know if possible and how?

Thanks

Hi everyone.

Basically when the browser is (I think) idle while watching YouTube, FF is constantly backing up (the timestamp in the backup file name keeps getting updated). From the settings page I thought it once every 24 hours. I noticed from higher than normal CPU usage impacting FF and the Windows search indexer. Which reverted to normal once I disabled the backup.

I checked the about config:

• browser.backup.scheduled.minimum-time-between-backups-seconds

Is set to 24 hours (86400 seconds)

But I also noticed:

• browser.backup.scheduled.idle-threshold-seconds

Is set to 15 seconds(!). Is that what I think it is? Back up whenever there's a 15 sec idle window, regardless of the minimum? Can I safely make that 86400 seconds too, or does it do something else entirely?

Many thanks in advance.

Hi I just saw the new info on backing up my Firefox data. It sounded good, so I tried it. However I do not see 'Manage Backup'. Instead it asks 'Choose backup file'. I have never knowingly backed up Firefox, so I do not know where this backupfile is located... How can I find it? How do I create a new backup file? Many thanks An

I am unable to follow instructions for activating Backup in Firefox. I don't even have a Manage Backup button. What I have in its place is:

Backup

Restore your data Use a Firefox backup file from another device to restore your data.

Choose backup file...

I am trying to create a backup of FireFox for moving from a Windows 10 machine to a new Windows 11 machine. The instructions for creating a backup don't make any sense.

--- Click the main menu, and go to Settings. Select Sync. Scroll down to Backup, and click Manage backup. Choose the location to save the backup file. ---

When I click the Main Menu, go to Settings, Select Sync, there is no Backup listed. If I search for the term "Backup", this is the result: "Sorry! There are no results in Settings for “backup”. Need help? Visit Firefox Support".

Syncing is on, so I am assuming that FireFox is being backup?? Or am I missing something somewhere?

Firefox update today 1-14-26 says Restore FF with a backup file" Instructions say go to Settings/Sync/Backup/Manage Backup. My Sync has no Backup option, only shows: Sync Manage account Device Name Syncing: ON You are syncing these items across all your connected devices: Bookmarks Open tabs Add-ons Settings Connect another device . How to proceed?

(I don't recall setting Syncing to "On" before; it also showed me as automatically logged in to my account.) Assistance appreciated! Thanks!