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Mac App Store and identified developers: When you try to open a new app and it’s not on the list of identified developers that’s saved within the operating system, the Mac tells you it can’t.
. In the Safari app on your Mac, look for a placeholder on the page, such as “Plug-in missing” or “Click to use Plug-in.”. Click the placeholder. Follow the onscreen instructions. To change plug-in blocking, choose Safari Preferences, click Websites, click the plug-in, then choose from the pop-up menu for the website.
Look for a link to install the plug-in. Click the link to install the plug-in. If the plug-in is already installed, Safari will offer to turn it on for this website. You can turn it on for just this visit, or for all visits to the website. Check the webpage for a recommendation.
Websites often recommend the appropriate plug-in. If you can’t find a recommendation, contact the website’s owner. In Safari, choose Safari Preferences, then click Websites. View the list of your installed plug-ins (if any).