FORGET IT. Another worth add-on. Closest but "no cigar".
No language, All symbols which are not universal,
NO real Instructions how to RESTORE....
Says will do "magic" but does not tell you where, how to save, how to restore.....
HOW TO RETRIEVE OR REUSE.
and assumes you only have ONE PAGE OPEN.
I have sometimes 10-12 pages open for different projects but appears BOSS only knows about ONE PAGE/SESSION. One of my pages/session has 194 tabs and it seems to save one page but ignores the other 10 pages I need the BOSS to save the tabs for.

Keep looking, this one isnt "it" either. TOO simple, does very little.

I guess for 1 or 2 tabs is ok but why not just bookmark them. What we need is the SESSION MANAGER which Mozilla obsoleted. TOTAL CONTROL by the user, save each open page, hundreds of tabs.....