QupZilla

Long awaited feature is finally coming to QupZilla in next release. Session Manager was added by srazi.

Session Manager

You can now create, delete, rename, clone and switch to sessions. It is now also possible to manually restore one of the two automatic backups of last browsing session.

Other features coming in QupZilla 2.2
QupZilla icon is now displayed for PulseAudio playback streams on Linux.
TabManager plugin received number of fixes and also now switches to tabs with just single click.
GreaseMonkey plugin improved handling of downloading and updating scripts.

And also a lot of bugs were fixed, including often reported issue with setting initial zoom on webpages.

QupZilla icon for playback streams

Original plan for QupZilla 2.2 release was to be around the same time as Qt 5.9 was released. Unfortunately, Qt 5.9 contains bug (QTBUG-61621) that causes keyboard shortcuts not working when webpage is focused in QupZilla.
This bug is now fixed and will be in Qt 5.9.2, thus QupZilla 2.2 will be released when Qt 5.9.2 is released (currently listed as August 2017).