Perfect! Rated 4 out of 5 stars
Does exactly what it says it does. Only one problem. Once you set the options the first time, the option button is disabled, and you can't change anything. That really needs to be fixed! Would have been five stars, but we really ought to be able to change the options to suit practical and changing needs.
Other than that one problem, it's already saved me a ton of lost work, and I've only had it for an hour!
Options? What Options?
About the options button - SaveTextArea does not have an options dialog. That's why the button is disabled. You can get to the few configuration settings that are available via about:config (filter by savetextare), and in most cases you wouldn't need to change any of them anyway