wenn du Vorher mal eine Extension installiert hasht könnte dir das helfen
von
http://www.mozilla.com/firefox/releases/1.5.html):
Poorly designed or incompatible Extensions can cause problems with your browser, including make it crash, slow down page display, etc. If you encounter strange problems relating to parts of the browser no longer working, the browser not starting, windows with strange or distorted appearance, degraded performance, etc, you may be suffering from Extension or Theme trouble. Restart the browser in Safe Mode. On Windows, start using the Safe Mode shortcut created in your Start menu or by running firefox.exe -safe-mode. On Linux, start with ./firefox -safe-mode and on Mac OS X, run:
cd /Applications/Firefox.app/Contents/MacOS/
./firefox-bin -safe-mode
When Firefox is started in Safe Mode, all extensions are disabled and the Default theme is used. Disable the Extension or Theme that is causing trouble and then start normally.
ansonsten:
Lad dir die neuste Version von firefox runter.
Wenn du schon die neuste version hast versuch mal mit ner ein bisschen älteren.
Wenn du Glück hast tritt der Fehler nur in der Version auf, die du grad benutzt.
alle Versionen findest du hier:
http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/