Tip: always have 2 browsers, then you can look at stuff in the browser with no plugins / logins / cookies etc.
So if you're using Firefox then also have Opera or Chrome for alt use. Safari isn't very good, but better than some; Internet Exploder is best avoided unless you're locked in to a corporate software policy or something.
When you are installing any software, including a browser, always use the Custom install option, never use the Default install or Quick Install or whatever they call it. The Custom option may give you options to uncheck installation of useless toolbars, search engines and other spyware.