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Installation is quick and easy, just like installing an extension. That's because under the covers, the user script is actually converted into an extension. This means that management tasks like disabling and uninstalling work just like they do with extensions.
Note that user scripts are powerful software and have full access to your private data on any web site. So, for example, they could read all your web mail or access your online bank. Be sure to read the comments on any user scripts in order to decide whether you trust the author with this power.
[blog.chromium.org...]