Log Message:
Import firefox52-52.1.0 as www/firefox52.

Mozilla Firefox is a free, open-source and cross-platform web browser
for Windows, Linux, MacOS X and many other operating systems.

It is fast and easy to use, and offers many advantages over other web
browsers, such as tabbed browsing and the ability to block pop-up
windows.

Firefox also offers excellent bookmark and history management, and it
can be extended by developers using industry standards such as XML,
CSS, JavaScript, C++, etc. Many extensions are available.