According to Infoworld, Feb 5, 2010:

Baring any last-minute change of mind, Mozilla will permanently drop support for Mac OS X 10.4 from future editions of Firefox.

Mozilla stopped supporting Mac OS X 10.4, aka Tiger, in September 2009, but left a large amount of Tiger bits in the development code. Now, said Josh Aas, a platform engineer for Mozilla who works on Mac OS X integration, it's time to either restore support for the five-year-old operating system or remove the code from the development tree.

see the original article

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