The addon data should still be available. Please use an older version of firefox to save the data and update again. See here on how to install an older version of firefox.

Please only use this version to recover data as that version will be unsupported.

Seems to me that unless you have Session Manager add-on, there will be no place to put or use the data unless you continue to use the older version of FF. I, too, have lost a lot of valuable data with the loss of Session Manager. There should be a warning about the possibility of lost data before these upgrades.

Chuffnell said

After the automatic update, I discovered the add-on is not supported. Unfortunately, I had a lot of important info saved in some of the sessions. Does anyone know if this recoverable at all?

My hats off to you, I couldn't even find out how to ask the question. I have a 30 tab session manager session saved. I switxched on today to be confronted by something that seems to not agree with session manager and no way can i find a my previous session to manually open all the tabs again. Has your installed hoofed all my session info? quantum obviously and linux.

I REALLY WANT A SESSION MANAGER IN FIREFOX QUANTUM!

I DO TOO!!!

This is an alternative addon that is developed for the newer version of Firefox, https://addons.mozilla.org/en-US/firefox/addon/tab-session-manager/

This addon also allows you to import the ".session" file from Session Manager.

jagan605 said

This is an alternative addon that is developed for the newer version of Firefox, https://addons.mozilla.org/en-US/firefox/addon/tab-session-manager/ This addon also allows you to import the ".session" file from Session Manager.

Nobody likes it. Come on Mozilla, you're big enough to bring back our previous Session Manager or offer an updated one.

signup23 said

Nobody likes it. Come on Mozilla, you're big enough to bring back our previous Session Manager or offer an updated one.

Did you try my suggestion? It provides a way to directly use your data from the previous addon.

If only it was that simple. I installed the tab session manager, but without my original session file I can't recreate the last session. I can't find any recent sessionstore files, the installer must have got rid of them?

I have taken the sessionstore files and moved them to new/different computers before, so I am not a complete idiot. I did find some familiar URLs by greping with one of the URLs that will be in the session file, as search term. I now have to go though the files the search term was in.

According to https://www.mozdev.org/source/browse/sessionmanager/src/sessionmanager_bootstrap/defaults/prefs.js?rev=1.5;content-type=text%2Fplain the file should be named "backup.session".

All my recent backup sessions and sessions have gone.

jagan605 said

This is an alternative addon that is developed for the newer version of Firefox, https://addons.mozilla.org/en-US/firefox/addon/tab-session-manager/ This addon also allows you to import the ".session" file from Session Manager.

This didn't work.

Prior to being forcibly migrated to Quantum today, I have restarted Firefox at the beginning of each work day and quit at the end, and each time my previous day's session/state was successfully recovered; but the .session files down in ~/Library have date-time stamps no later than two weeks ago. So something weird is going on there. But never mind that. Once I did this, importing the most recent session state I could find, Firefox began running at 100% CPU and changing from one tab to another took ~5 minutes (and no, I'm not on an ancient slow machine -- this is a pretty new maxed-out Mac Pro). By the time it finished, the correct number of windows had been recovered; but not the correct tabs within them. Much of the tabs were gone, and the ones that remained were scrambled amongst the existing windows, breaking the sorting that had been there before.

I've spent almost two hours at work trying to solve this so far, and I'm worried about having lost hundreds of hours of other work as well if I can't recover my state. This surprise "upgrade" has been a complete disaster for me.

I had trouble, as well, with the installer obliterating session store info. Fortunately, I recovered almost everything from a recent back-up.

I downgraded my version of FF to the last one that ran session manager.

More recently, I tried the new Tab Session Manager, but had problems with heavy processor use. Hoping to try future versions and find that it works well.

In the mean time, I'm using FF only to go back to my old saves. Using Chrome, mostly for now. Hoping to be able to return to FF some day.

I'm very disappointed that this huge change was made with no advance warning to us street proles. Recovering what I could took a lot of time.

Hi contrawise, before Firefox 57, extensions had free rein to store and read files on your system. Session Manager had its own sessions folder with its own special .sessions file format and its own index file to keep track of them.

Now that is not possible, so session managers need to use other storage techniques and can't read the old index file or import old .session files automatically.

As long as you're experimenting, does this one work any better for you:

https://addons.mozilla.org/firefox/addon/my-sessions/

contrawise said

In the mean time, I'm using FF only to go back to my old saves. Using Chrome, mostly for now.

How does that work, you have to copy/paste URLs to Chrome?

If you want to convert a Session Manager .session file to a clickable list of links you can use in any browser, you can try this:

(1) Open your Firefox profile folder using either:

• "3-bar" menu button > "?" Help button > Troubleshooting Information
• (menu bar) Help > Troubleshooting Information
• type or paste about:support in the address bar and press Enter

In the first table on the page, click the "Open Folder" (or "Show in Finder") button.

(2) Double-click into the sessions folder

(Session Manager controls the sessions folder. Firefox uses the sessionstore-backups folder.)

(3) Extract tab URLs

Drag and drop a .session file onto this page, then click Scrounge URLs: https://www.jeffersonscher.com/res/scrounger.html

That tool is on my site, so please let me know if it doesn't work for you.