In 2010, Mozilla's Mike Beltzner announced that the forthcoming Firefox 4 would not be released for Power Macintosh computers,[REF] compatibility with Mac OS X Tiger having already been removed,[REF] making Firefox 3.6 the last supported release of Firefox on the older architecture and platform.
In parallel, developer Cameron Kaiser created a test build of Firefox 4 that could run on his Power Mac G5 at the same time as support was being withdrawn from beta 7 [REF].