Hello experts, I have a problem: I had a session window open with 116 tabs open and I cannot re-open them after restert of FireFox. I use the newest Firefox version 79.0 (64-Bit) on Windows 7 Pro SP1 and the extension "Tab Session Manager" I closed FireFay and as usual, after I restartef it, I waited for the opening of the series of my previous opened tabs. FireFax opened 117 tbs but did not fill in the URLs. They were all opened as new tabs. So I tried to open FireFox with deactivated add-ons. There it was possible to restore all the tabs. After that I closed FireFox again and opened it the usual way. It opened 116 tabs but they were all empty. I used the Add-on manager to shut down my extensions leaving only the tab session manager, AdblockPlus, NoScript. After restarting te tabs were empty again. In the list of the tab session manager I could find the sessions with 116 empty tabs (see ErrorTabSessionManager0.gif) but also the last session with the original tabs. See image ErrorTabSessionManager1.gif. I could even save this list from TabSessionManager. I updated PabSessionmanager to the newest version but that did not help. How can I get FireFox to load these previous tabs again, some of them are very important for me ? thanks for any help Jochen