Is there a way of preventing multiple instances?

Note that I AM NOT asking about "tab vs. window" behavior when following links, which is what a search on "multiple instances" seems to bring up.
I would just prefer a different behavior when firefox is started from a Windows shortcut. I sometimes forget to glance at the taskbar first, and don't notice that I already have a minimized instance of firefox running, want to browse something, and either doubleclick the desktop icon, or use the start menu. This winds up with two instances of firefox, which I start collecting two separate sets of tabs in, until I notice that I have two of them, usually when I want to refer back to a page I know I opened half an hour ago.
I would prefer a behavior similar to Thunderbird. If it's already running when you start it, it simply unminimizes the running instance. I would even prefer a simple message that simply says "Firefox is already running", similar to some other applications I use.
I realize that there are perfectly valid reasons why many people might want multiple firefox instances, but I don't. I can't find an option for controlling this. If it doesn't exist, I would like to suggest that it should have one.

If it got doubled due to some action, just sort your library by "Date Added," and the extra ones will be together on the time/date of the action, all in a row. Highlight the first that you want to get rid of, hold shift and click the last one. Then delete.

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    Hi,
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    Sync should kind merge these two automatically. Right? :)

    iPhoto is a consumer based software thus very limited, likely to about 10,000 is reasonable before performance starts to degrade as it lumps and loads everything at once.
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    Michael,
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