Originariamente inviato da Dwarf
Non è mai esistito Firefox 1.5, secondo me stai facendo confusione tra Mozilla e Firefox.....
Come no?
http://www.mozilla.org/projects/firefox/
Firefox 1.5 Beta 1 is now available for download. This is the first Beta release of our next generation Firefox browser, to be released later this year, and it is being made available to our developer and testing community for compatibility testing and to solicit feedback.

Note: This is not the final release of our Web browser, it has been made available for testing purposes only, with no end-user support.