Having lots of tabs loaded in Firefox eats substantial amount of system resources and can make things pretty slow and unorganized, the guys at Visibo Limited seems to have developed a perfect solution for the problem, TooManyTabs 0.3.1 - the free Firefox add-on from Visibo allows users to save more then 50 tabs in multiple-rows as idle tabs, just above the real Firefox tabs in unloaded form saving memory and CPU cycles, furthermore the ability to color and create separate rows provides better tab-organization functionality.

Simply Click The Up Arrow For Adding To TooManyTabs Row

At first instance it seemed no better then a Bookmark Manager like Read It Later, but further digging revealed this blog post at developers website, telling how TooManyTabs will try to load the restored tab from disk cache including the tab history and scroll position.