4-Step Computer Security Upgrade
Learn to encrypt your files, secure your computer when using public Wi-Fi, enable two-factor authentication, and use good passwords.
If, like me, you do any serious amount of writing in text boxes online (including webmail, blog commenting, etc.), Textarea Backup is a pretty useful Greasemonkey script for Firefox. It backs up your text area every ten keystrokes, ten seconds, and whenever the text area loses focus. You’ll need Greasemonkey to run it, and then you can install the Textarea Backup script.