MSU "High Priority" Update?

I generally advise novices to make sure "Automatic Updates" is enabled in their Control Panel>Security Center. I think the benefits of doing this, for most, outweigh the risks of missing updates.

But once every year or two, Microsoft tries to install some update software on the sly, usually under the guise of  a scary security update, that reminds me why I do not practice what I preach. I'm talking about patches that cannot be uninstalled, or come with no EULAs, or no explicit "I accept" permissions before installing, and which seem to serve an MS agenda. Some here might recall the WGAN (Windows Genuine Advantage Notification) tool fiasco a few years back.

For example:

Tonight I found my AV (NOD32) tray icon had turned a bright orange color, which usually indicates a problem. I opened my AV, and was informed I was missing a "critical" security update from MS. Specifically it was for  the "Microsoft Search Enhancement Pack (KB2237744)" update.

Well that was news to me! So I went to MSU>Custom button, and sure enough, it was offering this update (although as a "high priority", not a "critical" update. I'm not sure I understand the difference, but both terms sound important!). Secunia PSI did not indicate I was lacking this update.

So what does this update address? "This update addresses Search Enhancement Pack Firefox add-on issue."
When I search further, I find this: http://support.microsoft.com/kb/2237744

It's all gobbledygook to me. I never did install this update to software I had never installed in the first place. I have no MS toolbars in any of my browsers (much less in Firefox), to justify MS installing this in Firefox. Thank goodness, for there is no way to uninstall this unecessary update, once installed. As far as I can tell, this is not a critical or high priority update at all.

It took several reboots for my system to accept that I did not want this update. (I had to hide the update at MSU as well).

One might speculate why MS would try to inject new software or patches into Firefox. I won't. But I continue to allow no automatic updates from MS for precisely this reason. (I continue to allow my AV to auto update, but that is it).