Technically, Firefox has no Trusted Sites section. At least not like IE. The Exception section for cookies is only for cookies and would not provide any difference in security while surfing the internet. (Acceptance of cookies (or not) is a privacy issue, not security.)
However, if one makes use of the Firefox add-on called NoScript, then FF can have something much closer to a Trusted Sites setup. By default, NoScript blacklists all sites except a select handful. Through use and control by the user, the "trusted" list can then grow as needed. (See my screen capture of the plugins control panel of my NoScript.)
Using NoScript can indeed make FF more secure. BUT, it comes at a cost of being more of a hassle. In truth, most users would probably not like or wish to use NoScript. I am among those who feel it's use is worth the effort...
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