This add-on will save automatically the content in textarea or WYSIWYG editor when user is typing. User can recover the saved texts in the cache panel, even the tab or the window is closed unexpectedly.

If there is any textarea or WYSIWYG editor in the website you are browsing, you would find that there is an icon at the left of reload icon in the navigate bar. That's the trigger you could open Textcarea Cache Lite. if there is no textarea or WYSIWYG editor, it won't appear.