Unable to upload images while publishing my Android App

while publishing an app in android market , Google want two screen shots of a particular dimension and a high res. icon. I did what they said with exact dimensions they require.

Here, I have a problem .. I'm unable to upload screenshots and icon image while publishing my application in android Market. I receives an error something like browser extension and json etc .. Anyone please help The error is something like this

Unable to parse response. If you have a browser extension or add-开发者_如何学Pythonon installed which changes the JSON response, please disable and refresh this page.

I got the above error, then I tried it with the dreaded IE and it worked :/