Chrome Web Store - Lazarus: Form Recovery
Autosaves everything you type so you can easily recover from form-killing timeouts, crashes and network errors.
Ever had one of those “oh $*#@” moments when you've finally finished filling out a long form, and hit submit only to see an error message? And when you hit the back button, the form was blank... If so, you know you need Lazarus. And if not, you have a chance to install Lazarus before disaster strikes!
Lazarus saves everything you type so if the worst happens you can recover the whole form by simply clicking a menu item. The data can be encrypted and is saved on your machine so you know it's safe.