Try this: * Delete the Firefox icon from the dock. * Create a new icon by dragging the Firefox application to the dock. ---- You have a Mac with a PowerPC processor. Are you running TenFourFox? For an unofficial Firefox 17.0.2 ESR compatible version (TenFourFox) that runs on PowerPC Macs with OS X 10.4.11 or OS X 10.5.8 you can look at: *http://www.floodgap.com/software/tenfourfox/ *http://www.macupdate.com/app/mac/37761/tenfourfox *http://code.google.com/p/tenfourfox/wiki/ReleaseNotes1702 *http://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported *http://code.google.com/p/tenfourfox/wiki/QuickTimeEnabler *http://code.google.com/p/tenfourfox/wiki/AAATheFAQ