I'm in a similar situation to the GP. Addons used to help:
BarTab Heavy - Allows unloading of unused tabs. Lets tabs act like temporary bookmarks.
Tree Style Tab - Just great tab management.
uBlock Origin + uMatrix - Lots less cruft loaded and running to slow things down.
Session Manager - Lets me save windows with groups of tabs like bookmarks, works amazingly for looking things up and being able to restore a lot of references at once.
BarTab Heavy - Allows unloading of unused tabs. Lets tabs act like temporary bookmarks. Tree Style Tab - Just great tab management. uBlock Origin + uMatrix - Lots less cruft loaded and running to slow things down. Session Manager - Lets me save windows with groups of tabs like bookmarks, works amazingly for looking things up and being able to restore a lot of references at once.