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The issue you are experiencing might be due to not installed extensions for both browsers. Below you'll find articles on how to proceed: http://www.telerik.com/automated-testing-tools/support/documentation/user-guide/troubleshooting_guide/test-execution-problems/safari/safari-extension-not-installed.aspx and http://www.telerik.com/automated-testing-tools/support/documentation/user-guide/troubleshooting_guide/test-execution-problems/firefox/firefox-extension-not-installed.aspx