Each time a new testing session is created, the BrowserStack cloud assigns the user a pristine virtual machine. Our machines are restored to their original states, which means they are stripped of their registry contents, caches are erased, cookies are deleted, and all running processes are killed. Additionally, users do not have the privileges to install any programs on the machines. Therefore, after the restoration process is complete, the virtual machines are guaranteed to be tamper-proof. The advantage is that each time a test is run, the default settings are restored, thus providing an ideal test scenario.
Once the restoration process is complete, the virtual machine is then put through a series of validation checks, as a fail-safe mechanism. In the rare case that the virtual machine fails even a single check, it is taken off the infrastructure altogether. The machines themselves are in a secure network, and behind strong firewalls to present the safest environment possible.
At any given time, you have sole access to a virtual machine. Your testing session cannot be seen or accessed by other users, including BrowserStack administrators. Once you release a virtual machine, it is taken off the grid, and restored to its initial settings. All your data is destroyed in this process.
