One HSBC website lists Firefox 2.0 and Nescape 7.2 for online banking with Mac. Anyway, I am accessing HSBC-Qatar using Firefox 3.0.3 with MacOS 10.5 but Safari 3.1.2 does not work for me.
To login with Firefox, I need to 'Clear Private Data' from the Tools menu of Firefox - select everything except 'Saved Passwords'. Sometimes I need to do this twice and restart Firefox for good measure.