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Firefox Installer.exe does not work
Firefox Installer.exe starts and, after some time, gives that error message: Ihr Profil "Firefox" kann nicht geladen werden. Es ist möglicherweise nicht vorhanden oder ein Zugriff ist nicht möglich.
ప్రత్యుత్తరాలన్నీ (2)
Sorry to hear about this problem. The installer (or Firefox) has discovered a setting file pointing to a profile folder, but that folder either no longer exists or there is a Windows permission problem accessing the contents of the folder.
Are you trying to reinstall Firefox and connect to existing Firefox data, or are you trying to get a clean start?
You also could look at this article: Firefox ausführen, wenn Ihr Profil fehlt oder unzugänglich ist.