I hate typing in a long-winded response into a comment box or other such text field on a website. The reason for this is that if I hit the submit button and an error occurs, all of that text is lost. Sure, one can always type it into Notepad or something, then copy it over, but who wants to do that every time they fill out a form? Thankfully there is a handy browser plugin that can help with this.
Lazarus is a handy extension that saves everything you type into a text form. If you ever need to re-type something, you can simply retrieve it from the history, and paste it in. It can remember passwords that you type in, but only if you specifically set it to. You can also choose to password protect your text field history, if it makes you feel a little more safe. The extension works in Chrome, Firefox and Safari.