Default PDF Viewer changed to Edge or Acrobat after each PDF download

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I'm using SumatraPDF to view PDF files.Whenever I open or save a PDF file in Firefox, the Default PDF viewer is changed from SumatraPDF to Edge.If Acrobat Reader is installed and set as the default viewer, the setting doesn't change after each download.This appears to be a security feature to encourage PDF viewing in Microsoft-approved viewers that might prevent exploits.I've tried setting SumatraPDF as the default via:-click Start | Settings | Apps | Default Apps-click Choose default applications by file type-Select .pdf-Choose SumatraPDFThe window closes as though it has crashed (no error is

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