Write your content in an offline word processor like Word or Open Office and then copy-paste it in to your web form. If something is important then you're not really losing much (you only need to paste it in to the browser once after all) but you're gaining a lot by not voluntarily installing a keylogger.
As bonus if you save what you've written then you get a backup.
As bonus if you save what you've written then you get a backup.