Firefox hangs upon pressing a Browse... button in a file upload form
Firefox consistently hangs when you press the Browse... button on a form to upload a file.
This affects one single user account. The problem occurs even in new firefox profiles. Other users on this computer are not affected.
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The hang occurs also in firefox safe mode.
For us this was fixed by backing up then deleting the user's windows account profile. The problem disappeared in a new windows account profile so this was likely a bad or corrupted registry setting, but also possibly something in the %userprofile% files themselves.
It was actually possible to restore the firefox profile and use it without any errors.
Maybe a problem with the MRU keys in the Windows registry.
You can try to delete the MRU (Most Recently Used) ComDlg32 registry keys with the regedit.exe program.
Navigate to: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32
Delete the subkeys (LastVisitedMRU and OpenSaveMRU).
Be careful with editing the registry as there is no Undo possible: all changes are applied immediately.
You can export key(s) before making changes.