I\'m using Selenium Client 2.4.0 on Mac 10.6.6 with Firefox 5. Using the WebBackedSeleniumDriver, I\'m running a \"selenium.getEval\" command that causes a Firefox warning,
This issue appears for me when I do Selenium calls while web application is running some own crappy slow JS. Even if I catch the popup and retry after few seconds, FF is not responsive to Selenium anymore. The solution is to just put sleep 10
before otherwise any Selenium call would result in popup.