Konacha fails if browser uses extensions that add iframe

[paneq]

I experience:

Uncaught SecurityError: Blocked a frame with origin "http://localhost:3500" from accessing a frame with origin "chrome-extension://noojglkidnpfjbincgijbaiedldjfbhh".  The frame requesting access has a protocol of "http", the frame being accessed has a protocol of "chrome-extension". Protocols must match.

in google chrome in code:

// Check that all iframes loaded successfully.
  var iframes = document.getElementsByTagName('iframe');
  for (var i = 0; i < iframes.length; ++i) {
    if (!iframes[i].contentWindow.mocha) {
      (function (path) {
        mocha.suite.addTest(new Mocha.Test(path, function () {
          throw new Error("Failed to load " + path + ".\n" +
                          "Perhaps it failed to compile? Check the rake output for errors.");
        }));
      })(iframes[i].getAttribute("data-path"));
    }
  }

My workaround is to run the tests in incognito window where all extensions are disabled.

[jfirebaugh]

I guess the way to work around this would be to check the scheme and host of the iframe before trying to access contentWindow. Happy to accept a pull request that does so.