I am not a Mac user, but I have noticed some comments on this subject, try using Firefox 3.6 I think Apple have removed support for one of the plugins. This is discussed in this contributers thread: [/forums/contributors/707078 Java update 10 for Mac OS X 10.5 no longer supports the Java Plugin2] <s>The simplest '''workaround for this is to revert to Firefox 3.6''', and if it is only the one site you have a problem with consider instead using your current version of firefox for day to day work and install and use Firefox portable 3.6 for stockcharts.com * http://portableapps.com/apps/internet/firefox_portable/localization#legacy36 </s> ''' ''2nd EDIT simplest solution check Firefox is up to date using help->about firefox-> [Check for Updates]''''' * workarounds are being discussed here: [/kb/Using the Java plugin with Firefox/discuss/1578] and you may find reading that helps, but please do not post questions in that discussion * see also [[installing a previous version of firefox]] ----- Edit <br> if you follow the links you will eventually get to technical discussion between Mozilla & Apple developers on the subject ------ Further update <br> Firefox [https://bugzilla.mozilla.org/show_bug.cgi?id=668639#c30 developers] have used a workaroud patch, if firefox is up-to-date it should now work.