Anyone know how to enable session restore when using arkenfox user.js?

Ive opened user.js and set browser.startup.page to 3. according to the gui that should resume previous session (0=blank, 1=home, 2=last visited page, 3=resume previous session)

It does say, however, that "Session Restore is cleared with history (2811), and not used in Private Browsing mode", so I set userpref("privacy.clearOnShutdown.sessions", false); // [DEFAULT: true] to false, but still it opens to a new tab.

other issues: ff opens windowed, and Enhanced Tracking Protection settings dont save (I changed it to block all cross site cookies)

help appreciated :)