I am very surprised that this add-on has so few users. It has a very simple interface and some basic configuration controls. However, it is an absolute life saver when something you are writing within the browser (email, forum post etc) gets dumped by a page time-out, browser crash or similar. Textarea Cache saves everything you were writing, including italicised text where it has been entered, thereby saving you from fuming in anger and having to write it all out again! Just select the saved file, copy and paste the applicable text, and reinsert it back where you were writing it before everything went wrong. Damn useful!