The new firefox update cannot be opened on my version of Mac OS X. It's 10.4.11. When I downloaded the new version the computer prompted me: "are you sure you want to replace the newer already existing file with this older file?" and I thought it was a mistake because firefox just ran an update on my computer and it said this version was newer, so I downloaded it and replaced the already existing file. How do I download the older version? When I was prompted to download the 4.whatever version it said I was running a 3.6 or something.