Run JavaScript on every website when the page loads

After loading all or specific pages in the browser, I am looking to run JavaScript code (predefined code). Are there any browsers and plugins/components that allow me to achieve this?

The manual method involves opening the console (e.g. firebug) and executing the code. However, I prefer to have it done automatically.

Answer №1

If you're looking for a way to semi-automate tasks, consider using a Bookmarklet. Simply click on an item in your bookmark bar and run your JavaScript.

For complete automation within your browser (assuming you're using Firefox with Firebug), explore addons tailored to your specific needs. Grease Monkey, for instance, is a highly useful option.

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