Timberwolfweb browser is the name of an ongoing project created to port the Firefox browser to the AmigaOS 4 platform. The Release Candidate 3 version was publicly made available to download on September 5, 2012.
It is called Timberwolf because it's not an official version of Firefox and not part of the main Firefox development repository, and because the name "Mozilla Firefox" is a registered trademark; along with the official Firefox logo.
TimberWolf is a bounty funded project to port Mozilla Firefox to AmigaOS 4.  It was started in early 2009 as parallel to AmiZilla project that has the same intent. Amizilla had a more complex history, as it was started in 2003 from US firm DiscreetFX with the target of porting any running version of Mozilla engine based Firefox compatible browser to Amiga platforms. As long as Amizilla project was too ambitious the project was closed on November 19, 2009 without producing significative results. Timberwolf project is full managed by Thomas Frieden and Hans-Joerg Frieden (AmigaOS 4 core developers), who work at it as a spare time project. The first release has been made public in June 2010.
On July 23, 2012, the project was completed and money (6732.72 EUR) has been transferred to the Friedens.
Amiga version of Timberwolf/Shiretoko/Firefox is based on XUL user-interface toolkit. The developers had to port a wrapper to XUL into Amiga, which was called XULRunner, in order to being capable of then porting the whole Firefox to this platform.