Firefox doesn't see correct plugin to allow upgrade to 5

I am running the most recent version of Snow Leopard (10.6.8) and Firefox 3.6.16. Firefox 4 has been out for a long time, and now Firefox 5 is available. I usually get update notices from them, but did not get any notice that the newer versions were available. Following their support directions, it said to use their plugin checker, which I did. Everything has been updated except for the QuickTime plugin, because they say I have 7.6.3 and need to update to 7.6.5. This seems nuts, because I found the plugin in the Library/Internet plugins, and I have 7.6.6. In fact their Update button, when I click that, takes me to to 7.6.5, which is for Leopard, not SnowLeopard.
Should I just download Firefox 5 and see if it runs, since the newer plugin I would think would work with it? I'm particularly concerned because they are no longer supporting Firefox 3X, and obviously there are new security updates coming along all the time. Does anyone know if it will install? My concern is that it could disable Firefox completely, and I don't want that to happen.
All suggestions most graciously appreciated.

Try the solutions in [[Firefox exe is not a valid win32 application]]

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<blockquote>
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</blockquote>
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"browser.cache.disk.smart_size.first_run": false,
"browser.cache.disk.smart_size.use_old_max": false,
"browser.cache.disk.capacity": 358400,
"browser.cache.disk.smart_size_cached_value": 358400,
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<blockquote>
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Firefox doesn't see correct plugin to allow upgrade to 5

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