i need a plugin for firfox!

i have been using opera for its quality of saving sessions and the pages i am visiting; i can easily browse and get last pages back when i open it again; i have been searchin for some plugin of FF to enable such a fucntionality there but not found yet;
plz give me url if there exist some plugin for this purpose.

 

Go For Sessionsaver of firefox.

https://addons.mozilla.org/firefox/436/

Hope this is the one u want

 

Thanks a lot its exactly what i needed!

 

But a suggestion :

Dont use it
It always crashes FF when reading PM's for me.

I ultimately had to uninstall it as it used to crash FF.