Web browser plug-ins (sometimes just spelled plugins) are additional pieces
of software that add extra capabilities to your web browser, such as the
ability to view movies, run Java applets, or see Flash animations.
Unfortunately, since plug-ins run with all the privileges of real
applications, they can do absolutely anything to your computer. That means
you should never, ever agree to install a plug-in unless you have very
good reason to trust the source. Keep in mind that the Flash plug-in comes
with your computer, and most systems also come with a Java plug-in. Other
mainstream plug-ins include RealPlayer.
You will almost never have a good reason to install a plug-in that
isn't one of these, so say "no" when your browser asks you to install one,
unless you have an excellent reason to do otherwise.
See what is ActiveX? for more information
on this subject.
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