Except that all of those produce HTML. They are all HTML websites.

PHP stands for “PHP Hypertext Preprocessor” because it is a Preprocessor of HTML (HyperText Markup Language).

If we are talking about browser performance, none of those technologies that you mentioned execute on the browser at all and are therefore irrelevant to Firefox’s performance compared to another browser.

From a browser’s perspective, every website is HTML, CSS and JavaScript.

Can you give an example?

JavaScript has nothing to do with Java. They are completely different languages and environments.