sˈeɪvz ˌɪnfɚmˈeɪʃən ɐbˌaʊt tˈæbz ænd wˈɪndoʊz æz ðeɪ ɑːɹ klˈoʊzd, ɐlˈaʊɪŋ ðə jˈuːzɚ tuː "ʌndˈuː" klˈoʊzɪŋ ðˌɛm.
Saves information about tabs and windows as they are closed, allowing the user to "undo" closing them.