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ActiveX controls are Internet Explorer’s version of plug-ins.
For example, Internet Explorer’s Flash player is an ActiveX control.
Unfortunately, ActiveX controls have been a significant source of security problems.
ActiveX controls are like other programs – they aren’t restricted from doing bad things with your gear.
ActiveX controls are actually not Internet Explorer-only.
They also work in other Microsoft applications, such as Microsoft Office.
ActiveX controls only function in Internet Explorer.
A website that requires an ActiveX control is an Internet Explorer-only website.
Security Concerns
You should avoid installing ActiveX controls unless you trust their source.
nudge the box under Show and select All add-ons.