1. Open Interesting plurkers in new tab via middle click 
2. Click "Recent Plurks".
3. Notice Failure. 
4. Enable Firebug console. ( page reloads )
5. Click "Recent Plurks" 
6. Observe its working 
7. Disable Firebug
8. Reload Page
9. Randomly one of 2 things happen 
9a { 
 1. Click Recent Plurks
 2. It doesn't work
}
9b { 
 1. Click Recent Plurks 
 2. It works
}
Closing the page with firebug disabled and opening it anew guarntees this sequence.

( Firefox Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b2) Gecko/20090115 Gentoo Firefox/3.1b2 )