As an example of the direction this could take beyond the basics done in SurfingKeys, consider saving individual windows to open in other browsing sessions, and individual tab groups to open in an active window. Managing sessions entire only sounds like a missed opportunity. I envision myself merging tabs I care across a chaotic session into a curated window (or set thereof) with tabgrab and possibly splitting the window thereafter into tab groups to organize different collections I plan to circle back to at some point, then save things so I can. With tridactyl doing the saving maybe one could tag sessions too, and have restored windows recall the tab groups and contexts within. Tags, tab group context, tab IDs and titles alongside tab URLs in the list are examples of metadata which can be used for matching saved sessions when one seeks to pull up their stuff on some subject. With existing minibuffer-style command line's fuzzy matching and completion (and multiselection iirc, but I forget how) this seems a recipe for a potent organizational tool.

Closing as duplicate of #2941 :)