Automatic Crash Recovery features built into the browser
Internet Explorer
Win7/8/10
%USERPROFILE%/AppData/Local/Microsoft/Internet Explorer/Recovery
Firefox
Win7/8/10
%USERPROFILE%\AppData\Roaming\Mozilla\Firefox\Profiles\<randomtext>.default\sessionstore.js
Chrome
Win7/8/10
%USERPROFILE%\AppData\Local\Google\Chrome\User Data\Default\
Files = Current Session, Current Tabs, Last Session, Last Tabs
.dat
files in LastActive
folder.dat
files in Active
folder