[Mediawiki-l] links navigation bar not working in Ferefox

[Rein]

I installed Wiki again, and now the problem is gone.
But I still can't figure out what caused it, because the sidebar is exactly the same, and all scripts and extra lines in monobook.php (in connection with the sidebar) had been removed.
It makes you uneasy to change anything again.
And why problems in Firefox and not in Explorer?
Rein