Browser For Os X 10 5 8

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I really hate having to buy new macs every few years. Between the machines and the software it is a big investment and a whole lot of time setting things up and learning how to use it.
I usually keep my macs as long as I can. My only problem now is the browsers. Firefox, Chrome and Safari don't seems to want to support 10.5.8. At least FF and Safari run but there are some sites I visit that don't work well with those old versions and the new versions can't be installed on 10.5.8.
Any suggestions on a browser that will let my macs live a little longer?
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Browser Only Os

Sorry - I assumed that you had to stay with 10.5.8. The usual reason is when using a PowerPC Mac, such as a G4 or G5 Mac. Those cannot be upgraded to any newer OS X version 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. Mac OS X 10.1 (Firefox 1.0.8), OS X 10.2 and OS X 10.3 (Firefox 2.0.0.20), Mac OS X 10.4 (Firefox 3.X), Mac OS X 10.5 or above (Current Version) License. Mozilla Firefox is a graphical web browser developed by the Mozilla Corporation and a large community of external contributors. Firefox started as a fork of the Navigator.