* Two windows user accounts: one admin account and one standard user account * Win 10 64 Bit Desktop, completely up-to-date Could the problem be caused by a too slow double click (= interpreted as two single clicks) and a concurring start of two Firefox instances? The user of that PC starts Firefox by double clicking on the task bar icon.firefox1.exe) makes it work (but this is not a solution of the problem because Firefox updates will no longer work then) Renaming firefox.exe to anything else (e.g.I did a closer look using ProcessMonitor64, but I could not figure out any abnormalities (maybe you can give me hint what to look for?) Disabling Windows Defender and Firewall as far as possible (meanwhile, I installed Bitdefender, so Windows Defender / Firewall are replaced).they worked without the need to start Windows). I did a complete virus/malware scan using ten different malware/virus scanners (MalwareBytes, Adwcleaner, TDSSKiller, MSERT, Sophos, F-Secure, Kaspersky, Bitdefender, Windows Defender, ESET), some of them started from external boot media (i.e.I deleted all mozilla folders in all subfolders of %User%\AppData and also cleared any temporary files there (this should delete all user profile data and all extensions).Uninstall 64-Bit Firefox and reinstalled 32-Bit Firefox.Uninstall 64-Bit Firefox and reinstalled 64-Bit Firefox.I already tried all the standard solutions, but nothing helped: Same problem when trying to start firefox.exe from windows explorer.
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