May 26, 2018
Saves and restores the state of all windows
Building upon Crash Recovery, this extension allows you to save the current state of Firefox history, text data, cookies and return to that state at any later moment. Besides the manually saved states, Session Manager automatically stores the current state in case of a crash.
All sessions are stored in the “sessions” folder inside your profile directory and can be moved around as any other file. To get to that folder, simply select “Open Session Folder” in Session Manager’s menu might not work on all OSes. Finally, Session Manager also allows to reopen the 10 last closed windows and tabs.
It is not recommended to use Session Manager at the same time as Crash Recovery which is completely integrated, SessionSaver or Tab Mix Plus which provide similar functionality on their own. In comparison, Session Manager currently stores more session data than Tab Mix Plus while not getting as complex as SessionSaver.