My firefox browsing way is to open every link in new tab. Going back and forth in same tab caches every page browsed in the tab so it increases memory consumption. In this I usually end up opening 40+ tabs. But tab management is super easy with firefox thanks to tree style tab extension. Even 40+ tabs opened my firefox memory consumption is much less than chrome opened 40+ tab (which is unmanageble due to shrinked size of tab bar)