I made a change in Control Panel -> Default Programs -> Set Default Programs -> Firefox -> Set this program as default. Before this change, when I pressed Shift+Enter in Far on an .htm file, Firefox would start as expected (I set Firefox as the "default browser" upon its first startup).
After pressing that Set this program as default button in the Control Panel, the behavior changed (but only when in Far). If Firefox is running, the .htm file is opened as expected. If Firefox is not running, pressing Shift+Enter starts Firefox but I get this error dialog:
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Firefox Safe Mode
Safe Mode is a special mode of Firefox that can be used to ...
I used Process Explorer and the Firefox command-line sent by Far seems correct:
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C:\..\Firefox.exe -osint -url "\...\x.htm"
Everything was working fine before I made the default change in Control Panel but I have no idea really what changed in the registry and I don't know how to undo it. Any ideas would be appreciated.