While it is recommended to use either the FlashArray Web Interface or PowerShell module to remove the vSphere Plugin there is a third option available. This is typically used if the other two methods are not successful for some reason and you need to use a more direct approach.
Step 1: Login to the vCenter Managed Object Browswer (MOB) by going to the following address in your browser: https://vCenter_IP_Address/mob
Step 2: Once logged into the MOB select the content option.
Step 3: After the content has been populated select ExtensionManager from the list of available options.
Step 4: While in the ExtensionManager locate the extension you wish to remove under the Properties section.
The above image shows an example of both the Everpure HTML and Flash Client plugin extensions as they appear within the vCenter MOB.
Step 5: Once you have found the extension you wish to remove you may now select the UnregisterExtension under the Methods option.
Step 6: A new window is opened where you will put the name of the extension you wish to remove (in our example we will remove the Flash Client). Input the value for the plugin and then select Invoke Method .
If you wanted to remove the HTML vSphere Plugin you would type "com.purestorage.purestoragehtml" for the value.
Step 7: After you have selected Invoke Method you can close the small pop-up window and then refresh the ManagedObjectReference:ExtensionManager page. After you have refreshed the page you will no longer see the vSphere Plugin extension listed under the Properties section.
Step 8: Verify the vSphere Plugin was successfully removed by logging out of the vCenter Server and back in again (the standard UI not the MOB).