PowerPC G3, G4, G5, or Intel processors (Universal Binary). Memory: Minimum 128 MB RAM (256 MB recommended). Hard Drive Space: Roughly 50 MB of free space. Key Features of the 2.0.0.20 Release
Since Mozilla has moved these files to their "End of Life" FTP archives, ensure you are downloading from a reputable source like the official Mozilla Archive or trusted sites like Macintosh Garden to avoid malware. How to Install on Mac OS X firefox 2.0 0.20 download mac
To run Firefox 2.0.0.20 on a Macintosh, your system must meet these classic requirements: PowerPC G3, G4, G5, or Intel processors (Universal Binary)
Move the Firefox icon into your Applications folder. firefox 2.0 0.20 download mac