I want to actually test the security of a sandboxed and hardened web browser after I implemented 3rd party security tools that claim to harden the browser.
So how can I or what approach should I follow to test the security of a web browser?
Edit: Specifically I want to test the sandbox capabilities of the 3rd party tools I installed. Do they really prohibit a malware from spreading all across the PC? Malware attack vector would be a drive-by download from a (simulated) infected website.