Thank you for your request. As it has received few votes over 4 years, it is now going to be archived.

Thanks for your request. As this has received 0 votes over 4 years, the request has now been closed and archived.

@waterfire I am also a long time Firefox user who has switched to Vivaldi. There is nothing better than Session Manager by Morac for Firefox. It automatically makes session backups, and restores them superbly. As far as I know, Vivaldi only has a manual session backup, so that is useless for me. Session Buddy is what I use. It is nowhere near as good as Session Manager by Morac for Firefox, but at least it makes automatic session backups.

@novaviper Unfortunately, turning extensions off may not be enough. As a test, rename your Vivaldi Default folder and see if it still crashes for you with a fresh profile (you can always rename back after testing) see https://forum.vivaldi.net/topic/10388/refreshing-or-cleaning-your-profile

Restoring sessions seems to be buggy. You should always save your browser session to make sure ('save open tabs as session'). If a third party session manager does the job better in your opinion, stick with that.