[[Installing Firefox on Mac]] is somewhat detailed on how to do the install. The requirements [http://www.mozilla.com/en-US/firefox/5.0beta/system-requirements/ are]: ---- ''Operating Systems'' *Mac OS X 10.5 *Mac OS X 10.6 ''Recommended Hardware'' *Macintosh computer with an Intel x86 processor *512 MB of RAM *200 MB hard drive space ---- What is that doesn't work for you? Could you please give more details? Thank you.