JavaScript is a standard web programming language that delivers interactive web pages. JavaScript takes advantage of the enhanced functionality and dynamic interfaces that a website may have to offer.

Luckily, there is a workaround—disable JavaScript on some sites ... When you're using Firefox, NoScript is the extension you need. The extension will stop JavaScript on every site by default ...

In other words, you can browse most sites in text-only mode. Nonetheless, you cannot allow or block specific websites from loading images and JavaScript on Firefox.