Javascript error OSX 10.4.11

maybe its wrong posted, but i dont find a simular topic:
The problem
at html-editors there wouldnt show the editor-icons in firefox (XMTLsuite, Tiny etc.) the attributes-info of the icons tells "not in cache".
second: calling my page www.kocherlebnis.de and there login for admin-page i get the watch, clearing cookies the page cwill loading.

First i thought its a real firefox problem: nope!
killing all prefs of fo and install it new - no change.

The problem was similar on iMac and macbook pro
Solution:
I decice to install the macbook pro completly new. Formating, installing OSX and all apllikations new.... what an horror but IT WORKS...
So it must be an error in the enviroment... but sorry i cannot install the complet iMac new, dont will loose settings, password and prefs ... no time for kiddy bussiness.
If its run after new installation of OSX there must something wrong in the OSX conf or files... it comes up after an update of OSX (dont remember which one)
Permissions are corrected. Sometime i get an JS error with following messege:
Fehler: Warning: unrecognized command line flag -psn 04587521
Quelldatei: file:///Online_apps/Firefox.app/Contents/MacOS/components/nsBrowserContentHandle r.js
Zeile: 706

Totally as i seen the problem must come from OSX...
How I can fix it without complete new installation? Any ideas?
Thanks in advance...

Only system actualisation solves the problem not!