Seriously, don't muck around with this... Hands down the best solution is to load up a single Windows VM and install a bunch of these standalone, sandboxed bro

Seriously, don't muck around with this... Hands down the best solution is to load up a single Windows VM and install a bunch of these standalone, sandboxed browsers from Xenocode: http://www.xenocode.com/browsers/ http://www.xenocode.com/browsers/ You can test across IE, Firefox, Chrome, and Safari versions.