Problem: errors like 'Denying load of chrome-extension://<extension id>/<path to file>. Resources must be listed in the web_accessible_resources manifest key in order to be loaded by pages outside the extension' are logged when debugging web application in Chrome
Possible reason: you might have other Chrome extensions installed that try to interact with JetBrains IDE Support extension used for debugging/Live Edit
Solution: search for <extension id> in chrome://extensions/ and try disabling it
Comments
In order to see the id, you need to checkmark the "[ ] Developer Mode" checkbox in the top right.
In my case Skype Click to Call was the culprit.