How to install Firefox "Stylish" css file? [closed]

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I wrote a 开发者_StackOverflowcss file that is for a private project I am working on, and I am wondering if there's any way to load it into Firefox's Stylish menu without copying and pasting the code?

I thought about putting it on userstyles.org, but like I said, this is a private project and I don't want it available for anyone.

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You can use "userContent.css" for Firefox. For more information check out Customizing Mozilla.

EDIT: To make the stylesheet site-specific take a look at Firefox Hack: Notes about site specific stylesheets