Can't open Explorer
When I right-click on a download and select "Open Containing Folder" nothing happens. However, if I click "Show Downloads Folder" in the libraries menu a directory (and the correct one as well) opens. If I click "Open Folder" in about:profiles, then nothing opens even though the location exists. This is occurring on a Windows 2008 64-bit OS with build Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0.
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https://support.mozilla.org/en-US/kb/update-firefox-latest-version?cache=no Did you update Firefox to the latest version 57.0.2
Yes I have.
Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.
A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?
The problem remains in safe mode.
Many have reported issues using the 64bit Firefox. Install the 32bit version from; Download Firefox For All languages And Systems {web link}
If this still does not work, you may have to downgrade for the time being.