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My desktop Firefox had been running very very slowly and freezing up, so I decided to download and install A new copy of Firefox. I did not realize that doing so was going to delete all my bookmarks and settings and everything. When it did, I was devastated. At first, I thought maybe there was a chance I could get it back because there was a folder on my desktop that said old Firefox data but there is nothing in there that was useful so I’m wondering why it’s even automatically saved and why what was in there? It saved if it’s not helpful for recovering Firefox. So I went to my mobile device and set a sync to sync my mobile device with the desktop device. Only the sink for some reason ran in the wrong direction instead of the mobile device, sending all the information to the desktop when I press sync on my mobile device, it took all the stuff from the desktop to my mobile device and now I’ve lost everything on my mobile device as well. I am livid. Please tell me there’s a way that I can retrieve all my bookmarks and my passwords from my mobile Firefox and then how I can get that information onto my Firefox desktop.

I tried to sync 2 times, but says it's complete, but their are no files showing. Once or twice I was able to sign in to the old yahoo, but it disappears and I can't find it again. I am not a lover of this new screen because all my info is gone. I can't even get my email without a ton of ads!!!!!!! I want my information back, now! I have work to do on my PC, but since I have no contact info,

I don't have access to the Firefox I had 2 days ago.  Firefox asked if I wanted to go to the original screen and I checked yes 2 different times, with no result. I think the all's ok is because it's syncing the new Firefox and there is nothing there.  Please, I need my information badly.

Sincerely. Sandra Suriano [redacted email from community support forum]

Hi,

firefox startet to crash frequently on my iphone (iOS 26.7.1). It was not even possible to scroll through the settings menu, and Background App Refresh was greyed out in the iOS settings for firefox. Therefore I reinstalled it. Afterwards, all settings were gone. I have synced the phone to my firefox account (which I use for 20+ years) only to learn that all bookmarks seem to be gone in firefox sync as well. Can you recover my bookmarks, please? What kind of a weired crash did I experience at all? Have I been hacked?

Thank you in advance!

I recently set up a new MOZILLA account. Unfortunately, when I logged into it with my main laptop, it sync'd me back to a older version of FIREFOX which was already running on another laptop.

It's not clear to me AT ALL how FIREFOX knows which data set to use as the target and which is the original source. That's probably part of the problem.

In any case, at this point, I've degraded my original FIREFOX. I don't know about the passwords going along with it...but I suspect i have problems coming my way there too.

Is there a way to UNDO the sync that was just performed? i do have an IDRIVE backup of the main computer as of this morning...in case that helps.

If so, how do I (in turn) use THIS DATA set as the one to sync?

Sorry if this sounds incoherent.

Thanks in advance for any help.

I recently got a new computer because my old one crapped out and trying to find my old account that I had all my history on. there is only one account that let me recover but there is no history or saved plugins I had or anything from the past. I haven't really used firefox much in a while but all my history should still be there. I have several email accounts and not sure which one I used for this account. here is a list of all my current email accounts, if you could tell me which one i used for the past several years so i can recover that acoount that would be great, or if I have the right account how to get all my history and saved information back. here are my accounts.

is the one that it let me recover but there is nothing in this profile???

Thanks Ed

I just saw this for the first time. I have limited storage space. My current profile is 3.05g in size. The instructions say Sync automatically updates Firefox profile data such as bookmarks, history, passwords and settings whenever you sign in with your Mozilla account

• If you use the cloud, is that Onedrive, or something else. Do you get to chose what is backed up, i.e., only bookmarks, history, passwords and settings? Or sessions, extensions as well? Or the entire profile?

• I had a problem with a corrupted sessionstore.jsonlz4 file that caused major behavior issues. Even after repair, all favicons were gone

• Do backup options include sessions and extensions?

• What if a backup was created with a corrupted sessionstore.jsonlz4, or corruption for any other source? Would that be reintroduced?

• If done locally, are the items compressed? My concern is does that mean Onedrive must be launched on startup. If you try to add any item to Onedrive local storage without Onedrive running, it will not sync

• Is it possible to have more than on backup at a time in cloud storage?

Firefox has exceeded all previous mess-ups by upgrading itself today (apparently sometime when my battery went flat and was then left recharging), and this happened despite my account being set for 'upgrades to be only installed manually'. Now every bookmark, all passwords and all the settings of my Home Page have been erased. I have no 'restore point' to resort to as supposedly all this info is synced to the cloud. But I can find no method to retrieve any of these files let alone one to restore them. This is a nightmare. Please help.

I have all my info in Mozilla sites, passwords... try to back up my new phone and WHAT.., back up the phone and erase all the info I have on mu computer!!!

That is crazy!

My old laptop crashed and I don't know how to access my old bookmarks and passwords.

Trying to go through SYNC did NOT help ... still nothing.

I need someone to help me figure this out.

I have reset/reinstalled Windows on this PC many times over roughly the past decade. Every previous time, I would reinstall Firefox, sign back into my Mozilla/Firefox account, enable Sync, and my data would come back: years of bookmarks, saved passwords, payment information, and other Firefox data.

I reset my PC again recently and did the exact same thing, except this time everything is missing.

Firefox Sync itself appears to be working normally. I am signed in, Sync is enabled, the appropriate categories are selected, and I can see that Firefox is syncing. The problem is that there seems to be nothing from my old Firefox data to sync back down.

I am also fairly confident that this is the same Mozilla account I have always used. This is the only email address I tested that behaved like an existing account with an existing password. Other email addresses I tried appeared to be treated as new accounts and asked me to create a password.

So I am not really looking for basic instructions on enabling Sync, manually syncing, checking the last sync time, or selecting which data types are synced. I have already gone through that.

What I am trying to understand is how an account that has successfully restored this same Firefox data after numerous previous Windows reinstalls can suddenly have none of that historical data available.

Specifically:

• Can previously synced Firefox data disappear from Mozilla's servers even though I did not intentionally delete it or disable Sync?

• Could reinstalling Firefox and signing into a newly reset/empty Firefox installation somehow cause the empty local profile to replace or wipe the previously synced server data?

• Are there circumstances where Firefox Sync effectively starts over with an empty dataset while continuing to use the same Mozilla account?

• Is there any server-side recovery, previous Sync state, historical copy, encrypted backup, or other mechanism Mozilla support can access when the current Sync dataset appears to be empty?

• Is there anything left to investigate on the old Windows installation/reset itself, such as a previous Firefox profile, Windows.old, recovery data, or another local copy, even if Firefox Sync no longer has the information?

• Is there any way to conclusively determine whether this account previously contained the missing bookmarks/passwords, rather than simply confirming that I am currently signed into the account?

The important distinction is that Sync is not currently “broken.” It appears to be syncing normally. The problem is that years of data that Firefox Sync had repeatedly restored for me in the past now appear to be completely absent.

I am trying to determine whether the old dataset may still exist somewhere, whether something could have caused the Sync dataset itself to be reset or replaced, or whether there is any remaining recovery path for the previous Firefox profile/data.

Hello,

after a rollback of my home system I looged into my Mozilla account to find out nothing synced over from the previous version that was installed on the same machine.

How can I recover everything (priority on passwords)

Best, Sebastian

Suddenly one day I noticed that all my website passwords for the Android app disappeared. The passwords were strangengly odd themselves because some were very old, others were recent and many were incorrect when I would try to use them and it seemed to be very random and not how they were originally saved. Anyways, they all disappeared one day and I don't know why or how. Apparently I had got signed out of my account for Firefox which I didn't even realize that I was signed into an account through the browser. I don't use just one same browser for the web I tend to use a bunch of different browsers since they all are disappointing. I'm just wondering why they all got deleted and why couldn't I sync the ones from my desktop to my Android. Thanks for the help.

Syncing is still something I don't understand I will tell you up front my smartphone is smarter than me I'm not techy somehow I watched Microsoft and Google interface with Yahoo and now I got each addresses answering each other's it's a mess on my end for the first time joining this I feel a fresh start for the first time I feel like I might be safe I'm not social media I don't post I don't post I don't copy I try to keep things simple so I don't understand a lot of things but I'm retired Marine sometimes my mind gets very reactionary bringing my stuff over mean something I'm going to have to accept that I don't like I don't even use Wi-Fi everything is hardwired ethernet that's the best I can describe my concerns thank you for your time

Hello, I have formatted my laptop and downloaded firfox, but I'm not able to restore my old bookmarks and passwords after I signed in to my account and sync. Could you help me with this and thank you.

I'm the only User of my Firefox browser and I noticed Firefox stopped filling out logins automatically when browsing on the internet. I was unable to access my logins in the preference menu under "manage saved passwords" as the list was empty. At first I didn't understand why. It seems that I hadn't created a "Profile" and was still using Firefox with my main account and as such was unable to access any previously synced data of that nature (under the updated Firefox configuration) I have now created a Profile but I don't know how to sync with my main account's login data list... I have read that I can locate a Profile folder to load previous data, but I'd rather find the main account folder if that's even possible, because the Profile folder hasn't synced any logins if I understand correctly.

Cheers for even reading this far ;)

Hi,

Over the weekend we had a break-in in our apartment and the laptop i use for work was stolen. I used Mozilla has my primary browser and had all the tabs and password i use on a regular basis saved there. As such I panicked a little and removed that PC from the synced units on my account. Now it seems I have no way to regain that information.

Is there anything I can do?

Thanks in advance, and best wishes

why did firefox delete most of my shortcuts on my old pc after i synced with my new laptop and how do i get them back. I am a senior of 71 yrs not a computer tech.this just screwed everything up for me!HELP!!

Hello if i backup my data on firefox account then i sign into new device then i again login my email and firefox acc then i did not got my passwords or bookmarks and history again. Then what's the use of that backup ? is that offline or online backup if offline then what if i reset my pc and then login back ? if online then there is no option to backup that data. Help me to get back my data.

Hello, Today I performed a factory reset on my laptop (Windows 11). Before i did that, I checked if my Firefox account has synced all it's data, bookmarks, history etc. was checked and I pressed "sync" button. Then performed all of the actions connected with factory reset of a windows including partition removal. After that installed Firefox, logged in, but had to reset my password because it wasn't saved within my Bitwarden. Then synced and it turned out, that there is no saved bookmarks on my account. Is there a way to return my bookmarks?

Best regards, Karol Picher