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This notice intended to alert you that if you test your website under this simulator and it doesn't load , it is because your website implements a security mechanism which do not allow your website to load under an iframe on another domain. Therefor, if you need to test imperatively your website under this simulator, you need to had an browser extension on Firefox or Google Chrome to proceed the test.

Under Firefox browser, Install the Add-on from here.

Under Chrome browser, Install the Add-on from here.