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copied!<p>When used with discretion, Greasemonkey should be perfectly safe to install and use. While it is definitely possible to do all manners of mischief with carte-blanche Javascript access to pages, Greasemonkey scripts are restricted to specific URLs, and will not run on sites that are not specified by the URL patterns in their headers. </p> <p>That being said, a basic rule of thumb is to consider most information on pages with Greasemonkey scripts active to be accessible to those scripts. It is technically feasible to play games like replacing input boxes (in which you might enter passwords or personal info), read any data on the pages, and send data collected to a third party. Greasemonkey scripts do run in an effective sandbox within the browser, and shouldn't be able to affect your computer outside of Firefox.</p> <p>That being said, in some respects, the risk is comparable to or less than that of installing any other small pieces of open source software. Since Greasemonkey scripts are simple open source Javascript files, it's relatively easy for a programmer to take a look inside and make sure it does what it says it does. As always, run strangers' code (of any form) with care, and take the time to skim the source code if the software is important to you.</p> <p>In general though, Greasemonkey scripts should be pretty safe. Try to use scripts with a large number of reviews and users, since these are likely to be more thoroughly vetted and analyzed by the community.</p> <p>Happy userscripting!</p>

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