Do you too check out movie trailers on apple.com when you are bored / procrastinating?
For quite a number of pages the movie doesn't play, instead you are told to get the latest Quicktime, which is a good joke for people stuck on mplayerplug-in.
Actually, the problem has already been resolved (see this discussion and the mplayer page), there is just no ready-made RPM yet:
1) According to the ArchLinux forums discussion, I changed
"QuickTime Plug-in 6.0 / 7:$" to "QuickTime Plug-in 7:$" in ~/.mozilla/firefox/pluginreg.dat
(not sure whether that is necessary)
2) I uninstalled the current mplayer-plugin and added the mozilla-xulrunner190-devel package (in place of Firefox development package) in yast
3) I got the mplayerplug-in daily build (3.55 probably works too, as it's just two weeks old) untarred, ran ./compile and make. Make install doesn't work, as the build files assume a different plugin directory, so copy the files by hand:
$ sudo cp mplayerplug-in*.so mplayerplug-in*.xpt /usr/lib/browser-plugins/
Control run on Tisiphone: Works also with just steps 2 and 3 and the 3.55 release.