Bookmarking doesn’t work for me, too limited, and starts a horrible trend of duplicating them. So they are useless for tab history managment. Also, the linear tab history is not very useful… same problem, the entries get duped eventually. I often don’t want to restore the tabs from the last day whatever, but restore an specific set of tabs. Some times even multiple sets, and switch between these.
I really would like an Firefox feature, where the tabs would be part of a “tab history tree”. Opening a link in a tab would add it as a “sub-tab” of the parent tab. In history.
So when a doing a search or refining one many times, this would end-up linking all the opened tabs to the originating tab. A new tree of tabs could be started by just opening an empty tab, and a “tab organizer UI” should allow to move/group that into an existing tab tree if needed. (The tab-bar UI doesn’t need to visualize the tree-of-tabs. The tabs would be just auto-organized this way in the history)
I think this would allow to clear all of the currently open tabs in any window, but the tabs could still be neatly restored from the history on per-tree basis in any window. Restoring a tab-tree would allow to continue making refinements to it, or clone it. Currently multi-window tab restoring in FF is kinda borked, and only the last window’s open tabs are restored automatically.