What does it do?
It overwrites console.log, console.info, console.debug, console.error and window.onerror and displays the input in a newly created div on top of your site.
How to use?
Add this piece of code somewhere in your html-page. In the <head> before other <script> tags is probably the best place. Save document, refresh browser.
» console-log-viewer.js on github
 .. depends on your copy/paste skills
 .. if this is not true, report here
 .. of course, it is not you