As part of Microsoft's ongoing effort to improve the security of its Internet Explorer browser, the company has started blocking outdated ActiveX plugins from being enabled.
ActiveX controls have been a feature of Internet Explorer for a very long time and help in enabling interactive content through the browser. Most third-party plugins such as Adobe Flash and Java make use of ActiveX to present content. However, it has been observed that these controls often have security vulnerabilities which can be exploited by hackers. Recently, Microsoft has started working on making IE secure and is now shifting its focus towards third-party plugins which can compromise the browser.
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