Are plug-ins downloaded from the web safe?

Macworld newsletter just sent out an article about the most useful Safari plug-ins (http://lm.macworld.com/t/1158383/7026212/108592/0/). How do you know if it is safe to install a plug-in that sounds very useful but has been downloaded from the web?

Hi Mike --
The only extension I've heard of having problems is Safari AdBlock, which I did not
on that list. I would trust MacWorld about 90% of the time. You can always delete them
if they don't work out. I would also trust their site for downloading.
Hope this helps.

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