I like the Toby extension because you can open a bunch of tabs in a window, press a button to save those tabs to a topic (or type in a new topic name to save to), and then press a button again to restore that topic when you want to resume work on it.
That being said, there’s no open source extensions like Toby, and even if there were, it’d still present fingerprinting/security issues. There’s also the fact I like to use TOR which you shouldn’t install extensions in. If I could find an external open source program to do this, it’d make it much easier for me to use TOR on a regular basis.
Any suggestions? Regular bookmarking with firefox sync won’t cut it (and I’m not even sure if that’s secure), and the CLI packages like buku can open bookmarks on a topic all at once, but can’t bookmark all open tabs at once.
edit: I’m also open to alternate interesting ways to get this sort of functionality.