Your Exobrain in Your Browser — Double Your Productivity with This Rated 5 out of 5 stars
Scrapbook is God among all Firefox add-ons. You will find nothing of the kind for any other browser, therefore this add-on alone is a compelling reason to ditch all other browsers in favor of Firefox.
P.S. Don't use it to permanently save your life-essential data, only use it for temporary and operational purposes. Use AllMyNotes software as your wiki-style lifelong journal instead.