When Safari crashes, you can choose "reopen all windows from last session" to restore tabs and windows. But if you forget to do this right away, and Safari crashes again, those previous tabs/windows are lost. Before Yosemite, the solution was to swap in a previous version (from Time Machine backup) of ~/Library/Safari/LastSession.plist In Yosemite, this no longer seems to work. I see that the following file exists in Yosemite: ~/Library/Saved Application State/com.apple.Safari.savedState Is this the file to swap in (from Time Machine) for this situation? Or must we swap previous versions of both files simultaneously? Or...?