error message and obfuscated code

Hello,

when I "Run As - GWT Development Mode with Jetty" my application from within eclipse and open chrome for that, there is a message like this in the development area of chrome:

App.html: 

Error in event handler for (unknown): TypeError: Cannot read property 'command' of undefined

    at chrome-extension://fhplmmllnpjjlncfjpbbpjadoeijkogc/js/hooks/content.min.js:1:228

The code shown in "content.min.js" is "obfuscated", so I cannot see what's wrong. I recompiled the app with Output Style "Detailed" and restarted development mode. But this doesn't seem to have any effect of what you see in chrome.

How can I examine what's causing the error?

Thanks
Magnus

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