A newer Core 2 Duo can even be upgraded to 10.11.3, depending on what you have - although you may not want, or need to do that - it is still an option for youīut, I need to know which iMac you have, and the System Profiler will tell me everything relevant about possible upgrades for your iMac. What is listed next to Model Identifier? (should be something like iMac9,1 - but I need to know what your iMac shows)Ī Core 2 Duo iMac can be upgraded to Lion (OS X 10.7.5) as a minimum.

That will bring up the System Profiler, where you can look at the hardware configuration (Hardware Overview)

That window will show processor speed and memory installed (plus a couple of other items),

What Mac do you have, and how much RAM memory is installed? You can make sure about that by going to the Apple menu, then About This Mac. Is there a particular reason that you have chosen not to upgrade your operating system? You would be better served if you upgrade your OS X, as you will have a lot of other options. That solution that I posted, with the PPC version of a nice web browser, is designed for those that want, or need to stay with PPC versions. Those cannot be upgraded to any newer OS X version The usual reason is when using a PowerPC Mac, such as a G4 or G5 Mac. Sorry - I assumed that you had to stay with 10.5.8.

Firefox 10.7.5 mac