Save and restore the state of windows and tabs. It also supports automatic saving.
https://github.com/sienori/Tab-Session-Manager
https://addons.mozilla.org/firefox/addon/tab-session-manager
https://chrome.google.com/webstore/detail/tab-session-manager/iaiomicjabeggjcfkbimgmglanimpnae/
https://github.com/sienori/Tab-Session-Manager
https://addons.mozilla.org/firefox/addon/tab-session-manager
https://chrome.google.com/webstore/detail/tab-session-manager/iaiomicjabeggjcfkbimgmglanimpnae/