# Example Web Browser Add-On for XUL-Capable Web Browsers
09:03:45 07/10/2018. Apollia's note:
I got this from: [https://github.com/cheeaun/example-fx](https://github.com/cheeaun/example-fx)
It was very helpful to me when I set out to build a web browser add-on.
<br>However, Firefox has been going downhill for years now, and as of the release of Firefox 57 (also known as "Firefox Quantum"), Firefox isn't XUL-capable anymore, and can't use add-ons like this.
But fortunately, other web browsers, such as Pale Moon, can! [https://palemoon.org/](https://palemoon.org/)
<br>End of text by Apollia.
An example Firefox extension for anyone to fork.
Originally forked from Robert Nyman's [How to develop a Firefox extension](http://www.robertnyman.com/2009/01/24/how-to-develop-a-firefox-extension/).
To point to this 'example' extension, create a file named *example@example* (same as `em:id`).