Unexplained "Blocked a frame with origin" messages in console log

Question

When I view the console on many websites, including Stack Overflow, I get (often several instances of) the following error:

Error in event handler for (unknown): Blocked a frame with origin "<URL>"
from accessing a cross-origin frame. 

It would seem reasonable to expect that perhaps a few websites I use have misconfigured CORS policies but quite suddenly it appears in my log for many sites that I use where it never did before.

I'm running the latest stable Chrome (34.0.1847.131) as of today, and I have tried closing out and rebooting to no avail.

Answer 1

The problem is likely not with the websites but with a chrome extension you have installed. The stacktrace you see below that error should give you a clue which one it is.

chrome-extension://somelongextensionidhere/somejavascript.js

View your chrome extensions under settings and check "developer mode" box at the top to view the extension IDs. The problem should go away once you disable the offending extension.