https://bugzilla.altlinux.org/show_bug.cgi?id=21555 is also valid when the seamonkey and mozilla-plugin-djvu packages have been upgraded to the Sisyphus releases:

mozilla-plugin-djvu-3.5.21-alt1
$ rpm -qa '*seamonkey*'       
seamonkey-ru-1.1-alt1
seamonkey-psm-1.1.18-alt1
seamonkey-webdeveloper-1.1.4-alt1
seamonkey-1.1.18-alt1
seamonkey-plugins-common-1.1.18-alt1
seamonkey-spellchecker-1.1.18-alt1
$ 

libXt's release has been left as it was in Branch 5.0: libXt-1.0.5-alt2.

Results:

$ seamonkey
LoadPlugin: failed to initialize shared library /usr/lib/browser-plugins-npapi/nsdejavu.so [/usr/lib/browser-plugins-npapi/nsdejavu.so: undefined symbol: XtShellStrings]
LoadPlugin: failed to initialize shared library /usr/lib/browser-plugins-npapi/nsdejavu.so [/usr/lib/browser-plugins-npapi/nsdejavu.so: undefined symbol: XtShellStrings]


mozilla-plugin-djvu's dependencies are not strict enough?