I am currently using Mozilla Firefox 3.0.1 inside a Thinstall Virtual container with flash and java also virtualized within. I made it using VMWare Thinstall/ThinApp. This makes my browsing experience more secure by eliminating or significantly reducing the chance of a browser vulnerability from affecting my physical drive. All changes remain in the virtual container and unless the malicious code was specifically written to check for virtual environments created by Thinstall/Thinapp, the harmful code will only gain control over the virtual environment and not the entire physical system.
I occasionally delete the "Thinstall/Mozilla Firefox" folder which resets everything back to the default I made whenever I created it. It also deletes anything malicious that may have been left behind in the virtual environment. I highly recommend running your browser like this for obvious reasons.
In addition to the extra security, I can simply copy my Firefox executable over to my flash drive and have a secure portable Firefox. I've got a copy (default is Firefox 3.0.1, but is update'able' if a new version comes out) hosted on my site if anyone would like to try it out, just give me a PM.



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