Various implementations are described herein for detecting and modifying security settings on a computing device to run a web application using a web browser. A loader application detects security settings on the computing device, determines if the security settings will allow the web application to run and function correctly on the computing device, and if necessary, modifies the security settings to allow the web application to run and operate successfully. Further, described herein are techniques for facilitating communication between components corresponding to a web application running in a web browser and external resources.