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If the source for resources on a page is through an FTP connection, it is possible to trigger a series of modal alert messages for these resources through invalid credentials or locations. These messages cannot be immediately dismissed, allowing for a denial of service (DOS) attack. This vulnerability affects Firefox < 66.
Use CWE-399, Mozilla vendor hub and Firefox product page to widen CVE-2019-9809 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-6786, CVE-2026-6785 and CVE-2026-6776 for nearby disclosures in the same product family.