sicher wird es das sein, ich wette, du hast eine installer version über eine alte zip-version installiert. das war dann keine gute idee
ZitatIf you are experiencing a crash while typing in the Firefox address bar, you can fix the problem by uninstalling Firefox 1.0.1, completely removing the Firefox program folder (probably C:\Program Files\Mozilla Firefox on Windows or /home/<user>/firefox-installer/ on Linux), and reinstalling Firefox 1.0.1.
To avoid this crash and other problems, do not install a new version using the installer into the same folder as an older zipped installation.