How to disable IE9 add-on performance notifications, you Idiots
Within days of an almost painless deployment of Internet Explorer 9 across the site, I began to spot this annoying little git popping up on some of the older machines:
This is a new and well-intentioned feature of IE9 called the Add-on Performance Advisor. Yes, a lot of add-ons are bloated, steaming, piles of manure, which is precisely why I don’t permit my users to install them. Unfortunately, just having Java on many of my older machines is enough to trigger this, and if kids go around disabling that, the next thing that happens is I get a lot of calls from ICT lessons when all the sites they still use that rely on Java don’t work.
Annoyingly, removing the user’s ability to disable add-ons via Group Policy did not suppress the pop-up.
To banish it forever, you need one of the new Group Policy settings for IE9. Specifically, Windows Components\Internet Explorer\Disable add-on performance notifications.
To get these new settings to appear in your Group Policy editor, you’ll need to copy the updated inetres.admx and inetres.adml from a machine with IE9 installed into the appropriate folders in your Group Policy Central Store. Before you ask, there is no standard ADM template, because IE9 isn’t available for Windows XP, you idiots. UPDATE: As a commenter pointed out, ADM templates do actually exist, because some people are still stuck in the dark ages of using Windows 2003 domains.