Most reports regarding this issue are associated with Adobe software, including Flash Player and Acrobat Reader. An error on Mac saying “ Blocked Plug-in” typically means that the system has prevented a specific plug-in from running.
This is an important prerequisite for delivering a proper user experience, but with the caveat that these enhancements largely have a third-party nature and may become a source of security issues. Plug-ins are intended to make sure a system component, such as a web browser, supports certain features or types of content provided by websites and other modern electronic services. This article explains the rationale behind a blocked plug-in on Mac and provides a workaround for the error, including a way to remove the misbehaving app.
