I feel it's better to prevent your browser from being HiJacked than to fix it. If your browser has not been HiJacked yet and your worried. Download and use SpyBot Search & Destroy which is a FREE program and under Advanced setting enable TeaTimer. TeaTimer will not allow anything in your registery to be altered without asking the user first, much like your firewall does for software programs.
You can find a copy here:
http://www.download.com/Spybot-Searc...ml?tag=lst-0-1