Embedded Quicktime not working

[Anonymosity]

I am using Firefox 4.0.1 on Mac OS 10.6.7. The embedded movie on this page does not even appear with this setup, whereas it appears with Opera and actually plays with Safari. It also worked perfectly with Firefox 3.6.17 on Mac OS 10.4.11. What is going on with FF 4.0.1? What is so special about this particular clip?
http://mac.sillydog.org/qt/mov/embed_s3.php

UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0.1) Gecko/20100101 Firefox/4.0.1

[Antony]

Well, that page used the old HTML code on calling plug-ins, it used <object>...<embed>. (It was created in 2005/2006 period.)

I believe there's another factor into that. In your new Mac (Mac OS X 10.6.x), you might not have QuickTime 7 installed. (QuickTime 7 for Mac was not installed by default, you have QuickTime X.) And if my guess was correct, the old HTML method called specific plug-in, i.e. QuickTime 7.

Anyway, you can install QuickTime 7 from http://www.apple.com/quicktime/download/ , it is safe to have both QuickTime 7 and QuickTime X on the same Mac.

UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.17) Gecko/20110420 AlexaToolbar/alxf-2.11 Firefox/3.6.17

[Anonymosity]

It is so picky, it wants a particular version of Quicktime? Why does Safari work with it, then? It is not something that I am going to worry about if that is the problem. The caption actually says it needs Quicktime 5 or later.

UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0.1) Gecko/20100101 Firefox/4.0.1

[Antony]

Sorry for not wording properly, I believe it requires QuickTime Player (the previous one), not QuickTime X.

In my Mac, it works with Firefox 3.6.17, but under close inspection, Firefox calls QuickTime plugin (the one from QuickTime 7) for playing that embedded video.

I don't have Firefox 4 yet.

As for Safari, Apple might have done some special coding to it.

UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.17) Gecko/20110420 AlexaToolbar/alxf-2.11 Firefox/3.6.17

[Fulvio]

My FF 4.0.1 was working fine, until a problem arose (discussed in the Chrome and Safari newsgroup, because it seems tied, somehow to Chrome). Firefox 4.0.1 crashed three times in a row, never showing up. The first two times the Crash Reporter failed to send, sending my report only on the third crash. I had opened the Task Manager, and with each crash the plugin-container.exe appeared multiple times. At one time a box indicating that there was a problem with Quicktime initializing showed up.
I have never moved from using 3.6.17, keeping 4.x only on approval, but it does not look good.
But would this be applicable to my PC?

UserAgent: Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1

[Anonymosity]

If it is the plugin causing a problem, the plugin container should be crashing, not Firefox. I had problems with Windows with Firefox 3.6.* reporting that Real videos were crashing the plugin container. I had to prevent Firefox from using the plugin container with the Real plugins.

UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0.1) Gecko/20100101 Firefox/4.0.1