Fix #52 - Tab history is lost in 2nd window
Fix #59 - Dragging multiple tabs doesn't work sometimes
Turn on unloaded tab style by default
Show "New Tab" menuitem by default
Show "Duplicate Tab" menuitem by default
Revert "Pick color from favicon"

This reverts commit eadb7058cef33380abf199e997d79f206a316aa1.
Revert "Fix colorStack option (#32)"

This reverts commit 630f96c68ef2e40dc470bc215bd082cd9bb8797b.