One typo correction in what I wrote yesterday - I was running 149.0 (not 140.0). Now I am running 149.0.2 [in a different profile than the one I lost over the weekend]. I really want to get my old profile back. Thanks.

A profile may be missing from the about:profiles page because Firefox has lost track of it, even though the profile folder still exists. You can create a new profile using the [Choose Folder] option in the Create Profile Wizard to select that profile folder, to recover the data it contains. For details, see the Profile Manager - Create, remove or switch Firefox profiles article.

This is a continuation of /questions/1575745 Cannot Upgrade from Firefox 149.0 (That question is solved, since you did update from Firefox 149.0 to 149.0.2)

You will normally find these files in the sessionstore-backups folder:

• previous.jsonlz4 (cleanBackup: copy of sessionstore.jsonlz4 from previous session that was loaded successfully)
• recovery.jsonlz4 (latest version of sessionstore.jsonlz4 written during runtime)
• recovery.baklz4 (previous version of sessionstore.jsonlz4 written during runtime)
• upgrade.jsonlz4-<build_id> (backups created during a Firefox update)

You can try to restore the upgrade.jsonlz4 file from the last update or use a utility to browse Windows System Restore points to see if you can find a recent sessionstore.jsonlz4 file.

You can copy a file with Firefox closed from the sessionstore-backups folder to the main profile folder and rename the file to sessionstore.jsonlz4 to replace the current file.

• make sure to backup the current sessionstore.jsonlz4

You can look at this tool to inspect a compressed jsonlz4 sessionstore file. This tool works locally, no uploading is done.

• https://www.jeffersonscher.com/res/scrounger.html

I am getting VERY CONFUSED. I had a new profile (in use while I attempt to resurrect my old profile), and when I did an Exit and restarted FF, I got a session with ONE tab; the various tabs from my previous session were LOST. Why??? I thought that when I did an Exit and then restarted FF, my previous session would be used.

Exactly what do I enter while creating a new profile so that my restored profile abnfpged.default is used?  And I prefer not to do something that will corrupt that restored profile.  And what is the difference between "default" and "default profile"?

The "Create Profile Wizard" will create a new profile "default user" with a random set of characters as a name in my Profiles directory. I do not know what to specify in the name field, and I do not want to create a new profile in the Profiles directory that has the new random-character name.

My restored profile IS in the Profiles directory, and I have placed in in the Profiles.ini file. But I cannot get FF to give me the option to use that profile as my default profile. I have modified my Profiles.ini file; here is the current version:

--- [Install308046B0AF4A39CB] Default=Profiles/jdfj91sd.default-release-1775960183850 Locked=1

[Profile2] Name=default-release Path=Profiles/abnfpged.default Locked=1

[Profile1] IsRelative=1 Path=Profiles/f1jq4mlq.default

[Profile0] Name=default IsRelative=1 Path=Profiles/jdfj91sd.default-release-1775960183850

[Install641D10338ABA448D] Default=1 IsRelative=1 Locked=1

[General] Version=2

[BackgroundTasksProfiles] MozillaBackgroundTask-308046B0AF4A39CB-defaultagent=lnvi5jn5.MozillaBackgroundTask-308046B0AF4A39CB-defaultagent ---

I assume that it SHOULD be easy to modify this so that FF starts with by abnfpged profile, but I have not found the "trick". As I wrote above, it has been many years since I worked with my Profiles.ini file. I am a retired IT professional, so I should be able to modify the Profiles.ini file to do what I want.

Can someone tell me what I have to do to the Profiles.ini file? In the past few days, I have never seen FF list my abnfpged profile as an option. Thanks.