Plug-ins are software programs that extend the capabilities of your Internet browser in a specific way. Not all browser plug-ins are harmful and some may be helpful. It is important to review the EULA of any browser plugin to make a determination of meeting enterprise standards or the standards for the home user.
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Accoona Toolbar adds a toolbar with Internet Explorer and changes Internet Explorer's search page. This has been seen bundled with freewares such as screensavers and desktop themes.