If you're that concerned about security, you can use an extension such as NoScript, or use a different computer for general web browsing and storing BTC.
Everyone should be concerned about security in Bitcoin world 
, everyone. NoScript is a way for most security web-related problems, but im not sure its for every exploit/malware. So if im not sure about something, i don't do it. Safe approach.
We are getting offtopic a little, if you don't store your BTC on our computer, help topic author please.