Userscripts are mainly javascript extensions for web browsers. Userscripts automate or customize actions, and they can change the layout or even "mash up" different websites.

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How do I install a userscript?

What are the steps to install a userscript for any of the major browsers? This question is for the benefit of those trying to get the minimal theme working. One browser per answer please.
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How can I disable javascript popups/alerts in Chrome?

Sorry if it's been asked. I've already found several solutions that aren't working. Not sure what I'm doing wrong. I don't want to disable all javascript, only Javascript alert boxes. The ones that ...
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How to install a private user script in Chrome 21+?

In Chrome 20 and older versions, you could simply open any .user.js file in Chrome and it would prompt you to install the user script. However, in Chrome 21 and up, it downloads the file instead, and ...