This feature looks at how to unblock Safari plug-ins and fix blocked Flash websites. This question about blocked plug-ins in Safari crops up from time to time typically following a security update. Back in Apple became serious about demanding better security updates from companies making plug-ins for its web browser.
If a plug-in is deemed by Apple to be a security risk then it will be blocked from Safari until the plug-in developer issues an update. Blocking plug-ins is for your protection, but it's still frustrating to have blocked plug-in messages when you should be browsing the internet. Flash is a target for internet ne'er-do-wells and frequently needs updating and frequently finds itself on the Safari browser plug-in block list.
However, the advice for updating Flash applies to other plug-ins as well. Updating a plug-in is the first point of call for fixing this problem. According to this Apple Support page: Safari typically alerts you to a new Flash plug-in download. If you see the Flash out-of-date error in a webpage follow these steps: Click the arrow to the right of the Flash out-of-date icon.
Double click the Install Flash Player icon and click Open. Enter your Admin password and click OK. If you have any web browsers open an alert window will appear. Close any open web browsers including Safari and click Retry.
The latest version of Adobe Flash will now be installed on your Mac and the blocked plug-in message should disappear. Enable plug-ins in Safari It is possible that your plug-ins have been disabled in Safari, and that you need to re-enable them. Select the checkbox marked "Allow Plug-ins". There are dozens of extensions available for Safari. Read more about the new Extensions for Safari here. Many people find this level of control overkill, but you may have adjusted these settings in the past and forgotten.
If you are having trouble with blocked plug-ins check the plug-in settings. Select the plug-in from the list on the left typically Adobe Flash Player will have the most settings. View the Configured Websites in the main section and ensure that ones you want to use that plug-in are set to Allow.
Using an out-of-date version of Flash in OS X without it being blocked Most of the time you should only use the very latest version of Adobe Flash for security reasons. However, some people are working to an older Flash standard and need to use an older version of Adobe Flash. Follow this Apple Support document for details about using older versions of Flash safely.