The most important bits are using a single process Firefox fork (ex: Palemoon, Seamonkey, etc) and disabling javascript by default with NoScript set in temp whitelist only mode. Second is behavior. All the NoScript in the world isn't going to save your browser if you attempt to run applications like Facebook or Twitter in it.

"Suspend Tab" for not loading inactive tabs is also important. I typically run about 50/50 in my active sessions in terms of active vs suspended tabs. "Search Tabs" and "Tab Mix Plus" are also very helpful. "Decentraleyes" also helps (mostly latency and privacy) by providing most not-bleeding-edge JS libs, fonts, etc locally only once.

Generally the first 1/3 of my tabs are long term tab groups I keep going back to for reference. These are almost all suspended most of the time they rarely change over the course of a single year. The second third is medium term tabs from projects I worked on but moved on from. I go through every month or two and bookmark projects I won't continue while closing the tabs. The last third is active tabs and changes day to day and week to week. I generally know the positions and relative groupings of all the tabs in the first 2/3 by heart. http://erewhon.superkuh.com/number-of-tabs-vs-date-2017.png http://erewhon.superkuh.com/whathappenedin2016accordingtotab...