Removed browser.sessionstore.enabled
Removed browser.sessionstore.enabled

https://bugzilla.mozilla.org/show_bug.cgi?id=449596
https://github.com/pyllyukko/user.js/issues/290#issuecomment-302955697

Toromtomtom/user.js,pyllyukko/user.js,nodiscc/user.js,Toromtomtom/user.js,nodiscc/user.js,pyllyukko/user.js