Go to the Audio tab and find the drop-down menu under "Music Synthesizer". From within the QuickTime Player, click "Edit -> Preferences -> QuickTime Preferences" (or double-click "QuickTime" in the Windows Control Panel) to open the QuickTime Preferences window. You can verify the QuickTime version your Mozilla browser is detecting in about:plugins or, starting in Firefox 3 and SeaMonkey 2, in "Tools -> Add-ons (Add-on Manager) -> Plugins". This will automatically replace the old version with the new one. If your version of QuickTime doesn't include an "Update Existing Software" feature or if the new version isn't offered this way, you can install the new QuickTime version "over the top" of your current installation. If you are installing Quicktime Alternative, make sure that the "Firefox/Mozilla/Netscape/Opera Plugin" is checked when selecting which components to install. Exit your Mozilla browser and close all other unnecessary programs. 
Windows 98/Me users should download QuickTime 6.5.2.Īnother option is the unofficial QuickTime Alternative (but read this for important information). Important: QuickTime 7.1.x is currently on the Add-ons Blocklist and does not work in Firefox 3. Windows 2000 users should download QuickTime 7.1.6 for use with Firefox 2 or Mozilla Suite/SeaMonkey. 
(You can also download QuickTime at PluginDoc but it might not be the latest version.)
Windows 7/Vista/XP users should download the latest QuickTime Player for Windows from Apple's QuickTime download or QuickTime Support page. 
3 Resetting the QuickTime browser plugins.
If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.
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