Firefox 21 will only run in Admin. mode on Win 7 Pro. Also when I installed FF21 it came with a nasty virus.
Those are the details. FF 21 will not run on my system unless I choose Run as Administrator. So far none of the guesses posted by your tech support about this question in the past have worked.
I have removed the virus and removed FF and reinstalled. Same problem. I removed it again totally and reinstalled, same problem. I have installed it again under an Admin account and I still have the same problem. All of the earlier versions of FF worked fine in user mode.
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Where are you downloading Firefox from?
When you download Firefox directly from Mozilla, it doesn't contain any "viruses".
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The following 3 or 4 downloads were all from Mozilla.org. This was both before and after the SaveId toolbar was removed. SaveId toolbar is a trojan that gathers information and is installed without consent. It is part of Search Results and seems to be downloaded with FF.
However, the problem I am trying to solve is why FF will only run in Administrator mode. All previous guesses that I could find on the internet have been tried.
I would run IE except for the ads.
Maybe it is time to try one of the other browsers.
I know that there are many posts on the internet dealing with FF having to be run under Admin. mode, but none of the guesses as to why have solved this problem. I also realize that most people running 21, judging from the lack of reaction, are running fine in user mode. But it would seem that the FF development team would be interested in this situation.
The trojan that came in on the FF install shut down Trusteer Rapport, a security software that my bank uses and recommends. The Trusteer support team worked with me to disable and remove the Trojan. That is what is called service.