Comment Saver

Comment Saver temporarily stores the content of comments in a browser cookie
just in case something goes wrong while submitting the comment. For example,
if the user forgot to include their name and email address and those fields are
required, the comment may be lost on some browsers. When the user returns to
the comment form, Comment Saver will automatically populate the comment box if
the cookie is still set. It will remove the temporary cookie once the comment
has been successfully submitted, or after one hour.