How do I install a standalone Greasemonkey userscript into Google Chrome?

Question

Installing Greasemonkey user scripts could not be any easier, usually, but how do you install a .js file which has already been downloaded like, for example, from GitHub, or copied from pastebin?

With Google Chrome's built-in Greasemonkey support there is no apparent interface to do this, and I cannot find any suitable location in the user directory.

Answer 1

Rename the file to *.user.js and drag and drop the file to Chrome. It'll prompt you if you want to proceed with the installation. The script will be converted to a Chrome extension and installed.