"If the addon doesn't show on your toolbar when you install the addon, you may have to right click on your toolbar and click customize and drag the storetab icon on your toolbar. Once there its very simple indeed to use. you could have open many tabs and then its just a click on the icon and save tabs, that's it done, you can close and reopen your browser many times, and when your ready for your tabs back, just click the icon again and restore tabs. You can restore the same set of tabs again and again, just as long as you don't save more tabs on top, as its only a 1 set store and restore, which makes it such a simple and very effective addon."--thanks for the describe from 2bad, that's just what I want to say.
the extension create a file named "storeTab.sto" which save the urls of tabs on your firefox profile roots.
someone may choose the "Show my windows and tabs from last time" options to remember the links.If you choose this option,everytime you open firefox,it'll recover the links you closed last time without asking.I think most users don't want that.If you use storeTab,you can recover the links when you want to recover!