I was trying to execute a functional test in Firefox browser. For that I selected FF and clicked on Run to execute the functional test in Firefox browser.

However while executing the test, I got this message and Test Studio was kept waiting for the browser to respond.

After investigation I found that in Add-ons of Firefox, Telerik Testing Framework Add-ons was not enabled.

Make sure to enable both the Add-ons and you will be able to execute the function test in Firefox.

After enabling that you should able to execute a function test in Firefox browser.