The Security tab includes the most important settings to help reduce the risk of drive-by downloads.
The Web Content section permits you to enable or disable various forms of scripting and active content. CERT/CC recommends disabling the first three options in this section, and only enabling them when you require the functionality of these features.
You should select the Block Pop-up Windows to prevent sites from opening another window through the use of scripting, or active content. However, be aware that while pop-up windows are often associated with advertisements, some sites may attempt to display content relevant to your usage of the site in a new window. Setting this option may therefore disable the functionality of some sites.
Use Safari without plug-ins and Java by disabling the options Enable plug-ins and Enable Java.
It is also safer to disable JavaScript. However, many web sites require JavaScript for proper operation.
You can also disable cookies and view or remove cookies that have been set.
CERT/CC recommends disabling cookies and enabling them only when you visit a site that requires their use. At this point, you should determine if the site is trustworthy (ie, contains no malicious content and is securely designed) and determine whether you want to allow cookies to access the site's content. After you are finished visiting the site, we recommend disabling cookies until you need to access a site that requires cookies.
You can limit cookies to the sites that you navigate to by selecting the option Only from sites you navigate to. This will permit sites that you visit to set cookies, but not third-party sites. Finally, we recommend selecting the Ask before sending a non-secure form to a secure website option. This will alert you when data is sent to a secure web site over an insecure channel.
Source: CERT/CC.
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I did exactly as was recommended,knowing full well there is problems with Quicktime.It is,to me,a superb browser,small,concise,very fast,no silly toolbars to play with,fully functional with much more room on screen for the user.Just have to go into preferences and get rid of Apple as the start page,insert your own.With this great browser,I can finally sideline the IE7 which is too bulky,far too slow and cumbersome.Highly recommend it.