Symptom:
For Using VMRC user need to enable browser plugin in the application

Conditions:
Requirements for Using the VMRC Browser Plug-In
To use VMRC, your Web application must be able to load the VMRC browser plug-in. The VMRC browser plug-in is supported for use with Microsoft Windows XP or later, and the Linux operating system. The Windows version of the VMRC browser plug-in is only available as a 32-bit application.
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Microsoft Internet Explorer version 7 or later
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Mozilla Firefox version 9 or later
The following browsers are supported only when using VMRC with vSphere.
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Google Chrome version 16 or later
Your Web application must use JavaScript to make use of the VMRC API.
VMRC is supported by all vSphere 5.1 and ESX configurations, and by all vCloud Director 5.1 configurations.