NOTE: You may have to wait a few seconds while the Java configurations are read before they begin to work on your Mac.
Safari (Mac OS X):
Step 1: From the drop-down menu, select Preferences.
Step 2: Select the Security Lock icon/tab at the top of the window.
Step 4: Close the dialog box to save your changes.
Step 5: Refresh your browser.
Firefox 3.5 and higher:
Step 1: Click on Tools and select Options.
Step 2: Click the Content button along the top of the Options window.
Step 4: Click OK.