Firefox Community Forum

Greetings and Good evening Windows was reset on 03/06/2026 due to problem. Option chosen was removal of Apps only No data was removed When Mozila was opened on 03/06/2026,It had all data since 2021. It was already registered with -removed-@gmail.com. Still history and bookmarks from 2021 were not restored. On 02/06/2026,0ne drive back up was also initiated. Please guide me as how to restore this.

Thank you Regards Himanshu Kotecha

email removed by Isaac H

I'm using firefox in ubuntu. A couple of minutes ago Firefox crashed. I restarted to a completely new Firefox. All my tabs, extensions, saved passwords, etc. were gone. This happened to me a few weeks ago. That time I found a solution: find a back-up of the old profile and manually restore it. I tried to reproduce that solution this time, only to find that there are no back-ups at all of my previous session. Is there a solution to this problem?

I am attempting to copy a FF profile from a Windows 11 machine I created it and am using it on to a brand new windows 11 machine on which I have also just installed FF on. Both machines are at FF 150.0.3. I have done a search online for the methods to do this but they have both failed for me.

The first one I tried was simply copying the profile from the existing (source) machine to the profile folder in the new machine however FF never recognized the copied profile on the new machine (I am using profile manager on both machines).

I then tried copying the profile using the method we used to use a while back to copy profiles which is to let profile manager create a new profile in the new machine, open FF so that it creates that new profile in the profiles folder then delete the contents of that profile leaving it as an empty profile (with the name of the newly created FF profile). Then, I selected and copied the *entire contents* of the source profile I was trying to copy and pasted them into the newly created profile I had just zero'ed out on the new machine so that the new profile now had the exact same contents as the source profile. I knew this copy was successful because it took a while to copy all of the data from the source profile to the new profile and the indicator showed it copying.

Again, FF did not recognize the new profile when I opened FF with the name of the new profile in the prof mgr.t.

Could someone tell me what I am doing wrong or what the problem may be? One problem I had when I first copied the source profile to my 32GB USB drive was a message saying "inbox folder is too big for destination system. " The source profile is 12.72 GB so there is plenty of room on the USB drive for it to fit. I have no idea why FF would have an inbox file so I just skipped it. The rest of the profile copied to completion once I did that but its size after copying was now only 7.65 GB, about 5 GB less than the original. Could this be my problem and if so, how do I fix it? Thanks for any help.

I had a power outage occur recently and when i booted my computer again I found that somehow my Firefox account was disconnected. All of my bookmarks and history gone, but things like accounts and site preferences were kept. The problem is that firefox is not saving my history and bookmarks cannot be made. I have checked common causes for this problems, like not activating sync and turning off "remember history", settings which were set up correctly.

My mac froze, force quit did not work, unplugged it, turned it back on, all bookmarks were gone and not able to add new ones. Would like to restore old bookmarks and add new ones.

Firefox updated on my macbook pro running Sequoia 15.5 but failed to restore my previously open windows. The option to restore previous session was missing. How can I get my previously open windows back, bearing in mind I'm not not a computer nerd? Thank you, Edouard.

I've been a loyal Firefox user since version 2.0. but to this day you guys have not made it easier for users to restore Firefox profiles. We in 2026 should be able to do the following directly from the user interface of Firefox. honestly its really taken me a long time to voice this opinion but it makes the app a tad less user friendly. i mean its easier to import from another browser but you have to pull out and search all sorts of folders to import from an old Firefox installation or a windows refresh (windows.old). Please, please implement this ASAP. we users have waited too long.

1. display a list of profiles (even from windows.old after a windows refresh) 2. automatically import that information 3. append existing bookmarks from the bookmarks backup if i choose to. 4. be able to browse the bookmarks and show the most recently used ones 5. be able to even reinstall the existing plugins (this one is minor)

the image attached is exactly showing what happens after a windows refresh. this feature is also great for administrators.

Regards, Shomari Ryan

The electricity here went out briefly. My I-Mac shut down. When the electricity came back on, the bookmarks were gone. And also, now I cannot bookmark anything-cannot initiate a new bookmark

bold textFirefox does not allow porting of bookmarks from one profile to another!!!!@!!!!!!!!! I can copy bookmarks to an external drive, but then how am I supposed to get them into another profile when the folder is the same as the one I copied--there is only one folder under library/application support etc. so doing it manually doesn't work; new profile gets error message, as account only allowed on 1 profile so Sync doesn't work.

Ok, I screwed up.

I was trying to solve a problem I've been having with regular releases of Firefox and it occurred to me try the ESR release so I downloaded and installed it. The good news is that it solved my problem, the bad news is that I just barrelled into it without thinking, assuming that my logins and bookmarks would just transfer over like with regular releases. They did not. It turns out I should have made a backup of those things first and I can't open the old regular release of Firefox to properly back-up those things now. Oops.

I've been reading lots of forum posts here and elsewhere trying to get those files into ESR and I haven't been successful. From the profile manager I've located the profile that still contains that info and I've tried:

Copying and pasting the "logins.json" and "key4.db" files from the "default-release" profile into the ESR profile which didn't work.

From "about:profiles" I also tried to "launch profile in a new browser" of the default-release profile so I can open that profile and properly back-up bookmarks and logins but I get a prompt to create a new profile which I tried several times and only resulted in several profiles of the ESR release.

Then it occurred to me that If I could just delete all instances of ESR and open the old default-profile then I could back-up the logins and bookmarks, THEN download and install ESR again and import those files but before diving into that I need to make sure that won't loose my original default-release profile info.

So experts, does that sound reasonable? Delete all instances of ESR so I can open the regular Firefox? What's the best way of going about that?

Thank you.

When I opened my Firefox browser this morning, all of my bookmarks were gone, the ones in the bookmark menu and the ones on the toolbar. I am unable to get any bookmark to save.

Hi,

i can see all my previous tabs in history but can't reopen window?

I didn't close those tabs, one time i opened mozilla and they were all closed.

Help me, thank you

bold text'I am so fed up with these updates loosing my passwords and data, why ? All my settings are messed up and last time it took two weeks to get everything back, why? I give up total idiots for releasing updates that are sub par!

""What happened:"" Yesterday I updated Firefox to 151 and noticed a "Profile" feature for the first time. I created a new profile, then saw a small icon with the Firefox icon that bothered me and realized it belonged to the new profile. I thought that the newly created profile is safe to delete and has to data within, so I deleted it. After that, Firefox deleted all old data and created another new profile and I lost old bookmarks, passwords, and browsing history.

Note: no warning was showed before deleting the profile.

What I tried: 1. Checked about:profiles profiles: no old data. 2. Opened the profiles folder in C:\Users\[my account]\AppData\Roaming\Mozilla\Firefox\Profiles: no old data found. I noticed one of the default profiles contains a places.sqlite file that’s about 2 years old: no old data, only default bookmarks are there. 3. Used Recuva to try to recover files — I recovered key4.db, login.db, and places.sqlite-shm but nothing useful so far. Environment/details: • Firefox version: 151 • OS: Windows 11 • No Firefox account Questions: • Is there any way to restore the old profile data from the files I recovered (key4.db, logins.json/login.db, places.sqlite-shm)? • Any other recovery steps I should try? • how to prevent the same thing in the future? Thanks

All but 2 of my previous saved windows have been lost. They are not recoverable or present when trying to use "Recently closed windows." How could this happen? More importantly, how can I recover them? They contain numerous tabs that will be impossible to recreate from memory.