Not only this, but you’ll also find that many add-ons or plugins simply won’t work with it anymore. We emphasize that using Firefox 16 is not a good idea because it is no longer updated or supported by Mozilla leaving it vulnerable to attack, malware, spyware and other online threats. Since Firefox 17 until the latest version of Firefox, you need at least OS X 10.6 Snow Leopard or higher to run the browser safely and efficiently on your Mac. In this article, we look at the risks and problems of using Firefox 16 and highlight what your options are. In this case you’ll need Firefox 3.6 for Mac which was the last one to support PPC Macs but is even older and more vulnerable than Firefox 16.
Note that this only works if you’re using an Intel Mac – if you’re still using OS X 10.5 or 10.4 on a PowerPC Mac, then we recommend this article about how to install Firefox on PPC Macs and OS X 10.4.11. However, we strongly recommend you upgrade to at least OS X 10.6 Snow Leopard or higher as Firefox 16 is no longer updated by Mozilla and therefore not secure anymore. If you’re using OS X 10.5.8 Leopard then you can still download Firefox 16 for Macs which works on 10.5.8. The first thing you should try is to make sure that you have the latest Java.
Java security settings are set too high.You are using outdated Java (below Oracle's security baseline).If a web page with Java Uploader or Downloader displays correctly, but does not upload or download chosen files, this may mean two things: If you click the Allow now button, you will encounter this problem again when visiting other web pages that use Java. When you click Allow and Remember Firefox adds the current webpage to an internal whitelist, whereby the Java applet will run automatically in the future without further intervention.
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