Methods, systems, and computer program products are provided for detecting a browser hang condition and causing the browser to enter into a mitigation state. For instance, a window or tab of the browser executes via a first thread of the browser, and third-party code executes via a second thread of the browser. The first thread issues a hang resistance message to the second thread and waits for a response from the second thread. The second thread processes the hang resistance message after processing all other messages in its queue. Thus, if the first thread receives the response, the first thread determines that the second thread has not entered into a hang condition. However, if the first thread does not receive the response, the first thread determines that the second thread has entered into a hang condition and subsequently causes the browser to enter the mitigation state.