You've probably already discovered this, but if you go to about:config and change browser.sessionhistory.max_total_viewers from -1 to (say) 3, you'll suddenly stop losing all your memory to FF. It's completely transformed dozen-plus-tab browsing for me, from a lumbering behemoth to a lithe, er, something lithe, and I've not noticed any decline in back/forward performance whatsoever.
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