When you tell Windows to save your data, it either can be saved in its original location or moved to a temporary folder. It sounds like your data was still in place, but maybe some of your data was recovered by signing in to a Firefox Account (partial Sync) and there actually is a more complete set. Let's check for a temporary folder:

Do you have a folder named:

C:\Windows.old

If you find that folder:

Set Windows to show hidden files and folders -- this Microsoft article has the steps:

https://support.microsoft.com/en-us/windows/view-hidden-files-and-folders-in-windows-97fbc472-c603-9d90-91d0-1166d1d9f4b5

Then explore that folder up to this point (if it exists):

C:\Windows.old\Users\<username>\AppData\Roaming\Mozilla\Firefox\Profiles\

If you find recent data there, please pause and we can suggest how to resurrect your saved files.

I do have the mentioned folder "Windows.old"

I have also explored till the mentioned folder "C:\Windows.old\Users\<username>\AppData\Roaming\Mozilla\Firefox\Profiles\."

After that there are two more folders further, one is of around 445 MB size named as "uzwps.default-release" and it consists folders like "bookmarkbackups" "crashes" etc.

Please, tell me what to do next.

Thanks!

Your missing passwords (and other user data) may be located in another Firefox profile. See Recover user data missing after Firefox update. Your missing passwords (and other user data) may be located in another Firefox profile.

Regards, Diana

There is an issue (bug) that logins imported via a CSV file doesn't trigger a sync event, so if you tried to transfer the imported logins via Sync then this might have failed.

You would have to have access to logins.json and key4.db with those logins and to copy/transfer the logins from the C:\Windows.old profile to the current profile.

• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

I do have the mentioned folder "Windows.old" I have also explored till the mentioned folder "C:\Windows.old\Users\<username>\AppData\Roaming\Mozilla\Firefox\Profiles\." After that there are two more folders further, one is of around 445 MB size named as "uzwps.default-release" and it consists folders like "bookmarkbackups" "crashes" etc.

One of the two folders has your most recent data. As cor-el mentioned, saved logins use two files, one stores encrypted data and the other stores the key to decrypt the data. You can copy the old files and paste them into your currently live profile folder in place of the current files. See this thread for more details on how to do that: https://support.mozilla.org/questions/1411859

Alternately, you can try transplanting a copy of your entire old profile. That doesn't always work, but if you want to try it, see Option #2 in the following post (your Source folder is the one under Windows.old instead of an external hard drive): https://support.mozilla.org/en-US/questions/1412515#answer-1578913

Thank you so much co-rel and jscher2000 for helping me.

I have followed the steps as co-rel mentioned and my passwords are now recovered from old profile to current one.

Thanks a lot guys! :)