Unfortunately Google Chrome has not yet implemented synchronous message API and extension "Block Yourself from Analytics" has become very ineffective for blocking Analytics scripts by using methods that are currently available. I will discontinue development on this extension for Chrome until Chrome implements synchronous message API for content scripts.
If you are willing to help please vote (make a star yellow) by clicking on a star located on the left side of the title for this issue: https://code.google.com/p/chromium/issues/detail?id=54257. Thank you.
I apologize to everyone using this extension, but there is no other way.