Reduce Firefox's memory usage

We've all been there.

You're deep into a self-love session and have no fewer than 30 tabs open in Firefox, each with a different stimulating medium (why choose between Keeley and Pinder when you can have both, simultaneously? God bless the internets!). Just before you reach that 8 seconds of bliss, however, your machine slows to a snail's pace. You pull out your hair and rend your garments in anguish; your masturbatory rythm is ruined, thanks to the 15 second delay in just switching between tabs.

Two possible pre-emptive measures could solve your problems: 1) buy a new computer, or at least upgrade your memory, or 2) go here and find different ways to reduce the 'fox's memory usage. Some of the suggestions are obvious (clear your history), but others are very clever (assign a memory cache).

Recently, but very belatedly, I chose the former; now I tab away, without fear:

Fap * Tab * Fap * Tab * Fap * Tab * Fap * Tab * Fap