Updating Firefox while logged on as LUA

I do most of my work while logged in on a limited user account (LUA). When the Firefox updates automatically download, I can't install them as LUA. And if I try logging in as admin or using runas, Firefox doesn't know there's a download waiting for install. That's because the automatically-downloaded updates are profile-specific. So Google turned out to be my friend.

In a thread on this subject at
http://flimflan.com/blog/FirefoxErrorResolvedOneOrMoreFilesCouldNotBeUpdated.aspx
is a posting from a way-too-anonymous chap named Justin whom I have taken the liberty of directly quoting in red below:
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In the command line of the limited user, paste and execute the following line:

runas /user:Administrator /noprofile /env "C:\Program Files\Mozilla Firefox\firefox.exe"

The "/noprofile" and "/env" flags will launch Firefox with administrator permissions but without loading the Administrator's profile and will continue to use the current environment. Firefox will then update as necessary and open a browser window. Firefox can then be restarted with the limited user's permissions and will cease to complain.
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Thanks, Justin!