Automatically run JavaScript code upon loading a specific website

Question

I've written scripts to filter out threads and posts in a programming forum by author.

But you need to post the code into the web console for each page individually.

I was wondering if it were possible and if so how (using either firefox or chrome), to set your browser up to run a specific script upon loading a specific site? Is it possible as an extension or plugin?

Answer 1

You can use Tampermonkey for Google Chrome

Tampermonkey is the most popular userscript manager for Google Chrome.

Greasemonkey for Firefox:

Allows you to customize the way a web page displays or behaves, by using small bits of JavaScript.

Answer 2

You can use dotjs.

dotjs is a Google Chrome extension that executes JavaScript files in ~/.js based on their filename.

If you navigate to http://www.google.com/, dotjs will execute ~/.js/google.com.js.

This makes it super easy to spruce up your favorite pages using JavaScript.