Various technologies and techniques are disclosed for enhancing security in a browser-based environment. A first browser application hosts one or more other applications. The first browser application is operable to load the one or more other applications on one or more separate domains than a host domain, using one or more cookies as a communication method between the first browser application and the one or more other applications. Input is received from a user to access a first browser application on a first domain. A selection is received from the user to run a second browser application from within the first browser application. A first cookie is created in a second domain, with the first cookie containing information to be used by the second browser application. The second browser application is loaded on the second domain. For example, the first browser application can be a browser-based software development application.