Overview:
A bookmarklet for use on reddit to mark all of your messages as read without having to click on each and every message!

Usage:
Drag and drop the link in the download section into the bookmark bar of your browser. Then whenever you want to makr all your messages as read, simply click on the bookmark while in your messages

Download:
You can download the source code from here or you can drag and drop the following compressed link into your browser's bookmark bar: Mark As Read (reddit.com)