You already have the latest version of Firefox for the PPC Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox This version is English language, but though I have not tested this but you may be able to install a language pack to change the UI to Dutch. Once the tenfourfox version has been installed, you can get the Dutch language pack for Firefox 4 from http://releases.mozilla.org/pub/mozilla.org/firefox/releases/4.0/mac/xpi - just click on the nl.xpi file, that should prompt you to install it. Once the language pack is installed, you need to change a hidden preference. # Type '''about:config''' into the location bar and press enter # Accept the warning message that appears, you will be taken to a list of preferences # Locate the preference '''general.useragent.locale''', double-click on it and change it value to '''nl''' If you are likely to want to switch between the languages, you can install the [https://addons.mozilla.org/firefox/addon/locale-switcher Locale Switcher] add-on. Also see http://kb.mozillazine.org/Language_packs

Thank you TonyE, I have installed TenFourFox. It looks a lot like Firefox; all my Firefox preferences are still there.