Below are the set of things a user can do to protect the browser:
a) Configure privacy settings: Review all the settings, see which are all options that are checked and unchecked.
b) Update the browser frequently: This needs to be done because, the browser code would have been updated to protect the browser from latest security holes.
c) Verify twice before installing plug-ins: Installing plug-ins are greater risks. So we must verify before installing those.
d) Install security plug-ins: You can use HTTPS, Web of Trust, LongURL.org for added security to the browser.