Firefox Plugins Check says I need new Quicktime - but I don't

Question

The Mozilla "Plug-ins Check" page says I have an outdated version of QuickTime Plug-in 7.6.3. So, I click the link to update it. Which takes me to Apple's website. Where I download a new version of QuickTime 7. So I download it -- so far, so good -- but then, when I go to install it, the Install Manager says that I ALREADY have the most current version of QuickTime (version 10) on my Mac, and it won't let me proceed.
So, now what? I can't find just a "plug-in" for Quicktime on Apple's website -- the only thing to download seems to be all of Quicktime. Should I disable the Quicktime 7 plug-in on Firefox? If I do, what will happen?
I am running Mac OS 10.6.3 and QuickTime Player 10.0 (113), and Firefox 3.6.3.
Thanks!
== This happened ==
Just once or twice
== I ran the Mozilla Plugin checker

Answer 1

The Firefox Plugins check URL does not distinguish at all between the different versions of OS X and different Apple OS X compatible computers, and the different versions of plugins for Firefox different versions of OS X, in the messages it generates.
Therefore:
a G3 PPC CPU machine user running OS X 10.3.9 (7W98) PPC or OS X 10.4.11 (8S2167) Intel;
a G4 or G5 PPC CPU user running OS X 10.4.11 (8S165) PPC or OS X 10.5.8 (9L30) UB;
an Intel CPU user running OS X 10.4.11 (8S165) Intel or OS X 10.5.8 (9L30) UB;
will ALL get messages relating to updates (of ALL types, not only QuickTime, but also including Java, Microsoft Silverlight, and others) that are compatible (at this time) with OS X 10.6.0 (10A432) Intel - OS X 10.6.5 (10H574) Intel, completely regardless as to whether they can actually run under the different versions of OS X.
Furthermore:
1) A number of G3 PPC CPU machines did not ship with enough VRAM (16 MB VRAM minimum required - 64 MB VRAM or higher recommended) to be officially supported under QuickTime 7 builds; If the G3 PPC CPU machine is a tower models with PCI slots, then it is possible to upgrade to a PCI video card with more VRAM to meet those hardware requirements, but G3 CPU iMac, iBook, and PowerBook users have to stay with QuickTime 6.5.2 or QuickTime 6.5.3 (some OS X users have QuickTime 6.5.3 for Panther and Tiger builds installed, from what Apple's "Software Update" used to provide...), as the VRAM cannot be upgraded on non-tower models.
Ridiculously, QuickTime 7.6.4 is the highest version that Apple supports under OS X 10.4.11 (8S165) PPC or OS X 10.5.8 (9L30) UB, and, OS X 10.4.11 users running Fiirefox 3.6.12 will get information directing them to update to QuickTime 7.6.6
QuickTime 7.6.5 and 7.6.6 are supported under OS X 10.5.8 (9L30) UB (there is no real reason that Apple couldn't have supported QuickTime 7.6.5 and 7.6.6 builds under OS X 10.4.11 (8S165) PPC or OS X 10.5.8 (9L30) UB as well, as it's the same code base, besides the fact that Safari v4.1.3 (4533.19.4) for OS X 10.4.11 (8S165) PPC and OS X 10.5.8 (9L30) UB was just issued by Apple, so the 15 million G4 and G5 PPC users get updates for OS X 10.4.11 without getting a QuickTime 7 update keeping pace)
The new QuickTime X is for OS X 10.6.x ONLY (currently OS X 10.6.0 (10A432) Intel - OS X 10.6.5 (10H574) Intel), and uses a different code base than QuickTime 7. Therefore, no one expects QuickTime X for OS X 10.4.11 builds, although QuickTime X still could be ported for the most recent OS X 10.5.x build, if Apple wanted to.
In conclusion, be forewarned as well, that before updating any version of QuickTime 7 or installing OS X 10.5.x or OS X 10.6.x, OS X users should always back up ALL the contents of these folders:
/Library/QuickTime
and
System/Library/QuickTime
and
~/Library/QuickTime
as some of Apple's installers and updaters can wipe the QuickTime files (codecs and components), installed in those locations.
I hope this information helps shed some light on these subjects...